{
  "name": "MR Maker public-domain song keys",
  "description": "Verified original keys, public-domain evidence and key-shifted backing tracks for public-domain songs, carols and hymns.",
  "publisher": "MR Maker (mrmrmaker.com)",
  "license": "CC BY 4.0 MR Maker",
  "licenseUrl": "https://creativecommons.org/licenses/by/4.0/",
  "methodology": [
    "Public domain: every named composer and lyricist died in or before 1955, the work was first published in or before 1930, and any traditional part is documented before 1900. Each credit links to its source.",
    "Original key: the key signature of the cited public-domain score or hymnal entry (most often the standard hymn-tune setting). Where the composer's autograph used another key, the notes say so.",
    "Audio: MR Maker transcribed melody and chords from that score and synthesised the accompaniment itself (piano, bass, soft pad and a quiet melody guide). No third-party recordings, samples, lyrics or translated lyrics are used.",
    "Every file is checked automatically for duration, peak level, loudness (about -16 LUFS), silent gaps, and that the key estimated from the audio spectrum matches the stated key."
  ],
  "updatedAt": "2026-10-10",
  "songs": [
    {
      "slug": "abide-with-me",
      "titles": {
        "en": "Abide with Me",
        "ko": "때 저물어서 날이 어두니"
      },
      "category": "hymn",
      "composer": "William Henry Monk",
      "composerDied": 1889,
      "composerTraditionalSince": null,
      "lyricist": "Henry Francis Lyte",
      "lyricistDied": 1847,
      "firstPublished": 1861,
      "originalKey": "Eb major",
      "keySource": "https://hymnary.org/tune/eventide_monk",
      "pageUrl": "https://mrmrmaker.com/songs/abide-with-me",
      "audio": [
        {
          "semitones": -3,
          "key": "C major",
          "url": "https://mrmrmaker.com/audio/songs/abide-with-me/-3.mp3",
          "durationSeconds": 66.3
        },
        {
          "semitones": -2,
          "key": "Db major",
          "url": "https://mrmrmaker.com/audio/songs/abide-with-me/-2.mp3",
          "durationSeconds": 66.2
        },
        {
          "semitones": 0,
          "key": "Eb major",
          "url": "https://mrmrmaker.com/audio/songs/abide-with-me/0.mp3",
          "durationSeconds": 66.3
        },
        {
          "semitones": 2,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/abide-with-me/2.mp3",
          "durationSeconds": 66.2
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "amazing-grace",
      "titles": {
        "en": "Amazing Grace",
        "ko": "나 같은 죄인 살리신"
      },
      "category": "hymn",
      "composer": "Traditional American melody (NEW BRITAIN)",
      "composerDied": null,
      "composerTraditionalSince": 1829,
      "lyricist": "John Newton",
      "lyricistDied": 1807,
      "firstPublished": 1779,
      "originalKey": "G major",
      "keySource": "https://hymnary.org/hymn/PsH/462",
      "pageUrl": "https://mrmrmaker.com/songs/amazing-grace",
      "audio": [
        {
          "semitones": -3,
          "key": "E major",
          "url": "https://mrmrmaker.com/audio/songs/amazing-grace/-3.mp3",
          "durationSeconds": 77.2
        },
        {
          "semitones": -2,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/amazing-grace/-2.mp3",
          "durationSeconds": 77.2
        },
        {
          "semitones": 0,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/amazing-grace/0.mp3",
          "durationSeconds": 77.3
        },
        {
          "semitones": 2,
          "key": "A major",
          "url": "https://mrmrmaker.com/audio/songs/amazing-grace/2.mp3",
          "durationSeconds": 77.3
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "angels-we-have-heard-on-high",
      "titles": {
        "en": "Angels We Have Heard on High",
        "ko": "천사들의 노래가"
      },
      "category": "carol",
      "composer": "Traditional French",
      "composerDied": null,
      "composerTraditionalSince": 1842,
      "lyricist": "James Chadwick (English paraphrase of a traditional French text)",
      "lyricistDied": 1882,
      "firstPublished": 1842,
      "originalKey": "F major",
      "keySource": "https://hymnary.org/tune/gloria_french",
      "pageUrl": "https://mrmrmaker.com/songs/angels-we-have-heard-on-high",
      "audio": [
        {
          "semitones": -3,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/angels-we-have-heard-on-high/-3.mp3",
          "durationSeconds": 60.6
        },
        {
          "semitones": -2,
          "key": "Eb major",
          "url": "https://mrmrmaker.com/audio/songs/angels-we-have-heard-on-high/-2.mp3",
          "durationSeconds": 60.6
        },
        {
          "semitones": 0,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/angels-we-have-heard-on-high/0.mp3",
          "durationSeconds": 60.6
        },
        {
          "semitones": 2,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/angels-we-have-heard-on-high/2.mp3",
          "durationSeconds": 60.4
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "auld-lang-syne",
      "titles": {
        "en": "Auld Lang Syne",
        "ko": "석별의 정 (올드 랭 사인)"
      },
      "category": "celebration",
      "composer": "Traditional Scottish melody",
      "composerDied": null,
      "composerTraditionalSince": 1799,
      "lyricist": "Robert Burns",
      "lyricistDied": 1796,
      "firstPublished": 1799,
      "originalKey": "F major",
      "keySource": "https://hymnary.org/tune/auld_lang_syne",
      "pageUrl": "https://mrmrmaker.com/songs/auld-lang-syne",
      "audio": [
        {
          "semitones": -3,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/auld-lang-syne/-3.mp3",
          "durationSeconds": 62.2
        },
        {
          "semitones": -2,
          "key": "Eb major",
          "url": "https://mrmrmaker.com/audio/songs/auld-lang-syne/-2.mp3",
          "durationSeconds": 62.2
        },
        {
          "semitones": 0,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/auld-lang-syne/0.mp3",
          "durationSeconds": 62.1
        },
        {
          "semitones": 2,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/auld-lang-syne/2.mp3",
          "durationSeconds": 62.2
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "away-in-a-manger",
      "titles": {
        "en": "Away in a Manger",
        "ko": "그 어린 주 예수"
      },
      "category": "carol",
      "composer": "James Ramsey Murray",
      "composerDied": 1905,
      "composerTraditionalSince": null,
      "lyricist": "Anonymous (American)",
      "lyricistDied": null,
      "firstPublished": 1887,
      "originalKey": "F major",
      "keySource": "https://hymnary.org/hymn/LHTC1918/536",
      "pageUrl": "https://mrmrmaker.com/songs/away-in-a-manger",
      "audio": [
        {
          "semitones": -3,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/away-in-a-manger/-3.mp3",
          "durationSeconds": 70.8
        },
        {
          "semitones": -2,
          "key": "Eb major",
          "url": "https://mrmrmaker.com/audio/songs/away-in-a-manger/-2.mp3",
          "durationSeconds": 70.8
        },
        {
          "semitones": 0,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/away-in-a-manger/0.mp3",
          "durationSeconds": 70.7
        },
        {
          "semitones": 2,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/away-in-a-manger/2.mp3",
          "durationSeconds": 70.8
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "blessed-assurance",
      "titles": {
        "en": "Blessed Assurance",
        "ko": "예수를 나의 구주 삼고"
      },
      "category": "hymn",
      "composer": "Phoebe Palmer Knapp",
      "composerDied": 1908,
      "composerTraditionalSince": null,
      "lyricist": "Fanny J. Crosby",
      "lyricistDied": 1915,
      "firstPublished": 1873,
      "originalKey": "D major",
      "keySource": "https://hymnary.org/tune/assurance_knapp",
      "pageUrl": "https://mrmrmaker.com/songs/blessed-assurance",
      "audio": [
        {
          "semitones": -3,
          "key": "B major",
          "url": "https://mrmrmaker.com/audio/songs/blessed-assurance/-3.mp3",
          "durationSeconds": 65
        },
        {
          "semitones": -2,
          "key": "C major",
          "url": "https://mrmrmaker.com/audio/songs/blessed-assurance/-2.mp3",
          "durationSeconds": 65.2
        },
        {
          "semitones": 0,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/blessed-assurance/0.mp3",
          "durationSeconds": 65.2
        },
        {
          "semitones": 2,
          "key": "E major",
          "url": "https://mrmrmaker.com/audio/songs/blessed-assurance/2.mp3",
          "durationSeconds": 65.2
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "come-thou-fount",
      "titles": {
        "en": "Come, Thou Fount of Every Blessing",
        "ko": "복의 근원 강림하사"
      },
      "category": "hymn",
      "composer": "Anonymous American tune (NETTLETON)",
      "composerDied": null,
      "composerTraditionalSince": 1813,
      "lyricist": "Robert Robinson",
      "lyricistDied": 1790,
      "firstPublished": 1813,
      "originalKey": "D major",
      "keySource": "https://hymnary.org/tune/nettleton",
      "pageUrl": "https://mrmrmaker.com/songs/come-thou-fount",
      "audio": [
        {
          "semitones": -3,
          "key": "B major",
          "url": "https://mrmrmaker.com/audio/songs/come-thou-fount/-3.mp3",
          "durationSeconds": 65.4
        },
        {
          "semitones": -2,
          "key": "C major",
          "url": "https://mrmrmaker.com/audio/songs/come-thou-fount/-2.mp3",
          "durationSeconds": 65.4
        },
        {
          "semitones": 0,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/come-thou-fount/0.mp3",
          "durationSeconds": 65.4
        },
        {
          "semitones": 2,
          "key": "E major",
          "url": "https://mrmrmaker.com/audio/songs/come-thou-fount/2.mp3",
          "durationSeconds": 65.4
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "deck-the-halls",
      "titles": {
        "en": "Deck the Halls",
        "ko": "덱 더 홀스"
      },
      "category": "carol",
      "composer": "Traditional Welsh (Nos Galan)",
      "composerDied": null,
      "composerTraditionalSince": 1794,
      "lyricist": "Thomas Oliphant",
      "lyricistDied": 1873,
      "firstPublished": 1862,
      "originalKey": "F major",
      "keySource": "https://hymnary.org/hymn/CoC1946/14",
      "pageUrl": "https://mrmrmaker.com/songs/deck-the-halls",
      "audio": [
        {
          "semitones": -3,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/deck-the-halls/-3.mp3",
          "durationSeconds": 78
        },
        {
          "semitones": -2,
          "key": "Eb major",
          "url": "https://mrmrmaker.com/audio/songs/deck-the-halls/-2.mp3",
          "durationSeconds": 77.9
        },
        {
          "semitones": 0,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/deck-the-halls/0.mp3",
          "durationSeconds": 77.9
        },
        {
          "semitones": 2,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/deck-the-halls/2.mp3",
          "durationSeconds": 77.9
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "good-king-wenceslas",
      "titles": {
        "en": "Good King Wenceslas",
        "ko": "선한 왕 웬체슬라스"
      },
      "category": "carol",
      "composer": "Traditional (melody TEMPUS ADEST FLORIDUM, Piae Cantiones)",
      "composerDied": null,
      "composerTraditionalSince": 1582,
      "lyricist": "John Mason Neale",
      "lyricistDied": 1866,
      "firstPublished": 1853,
      "originalKey": "G major",
      "keySource": "https://hymnary.org/tune/tempus_adest_floridum",
      "pageUrl": "https://mrmrmaker.com/songs/good-king-wenceslas",
      "audio": [
        {
          "semitones": -3,
          "key": "E major",
          "url": "https://mrmrmaker.com/audio/songs/good-king-wenceslas/-3.mp3",
          "durationSeconds": 49.1
        },
        {
          "semitones": -2,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/good-king-wenceslas/-2.mp3",
          "durationSeconds": 49.1
        },
        {
          "semitones": 0,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/good-king-wenceslas/0.mp3",
          "durationSeconds": 49.2
        },
        {
          "semitones": 2,
          "key": "A major",
          "url": "https://mrmrmaker.com/audio/songs/good-king-wenceslas/2.mp3",
          "durationSeconds": 49.1
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "happy-birthday-to-you",
      "titles": {
        "en": "Happy Birthday to You",
        "ko": "생일 축하합니다"
      },
      "category": "celebration",
      "composer": "Mildred J. Hill (melody of Good Morning to All)",
      "composerDied": 1916,
      "composerTraditionalSince": null,
      "lyricist": "Patty Smith Hill (attributed)",
      "lyricistDied": 1946,
      "firstPublished": 1893,
      "originalKey": "G major",
      "keySource": "https://en.wikipedia.org/wiki/Happy_Birthday_to_You",
      "pageUrl": "https://mrmrmaker.com/songs/happy-birthday-to-you",
      "audio": [
        {
          "semitones": -3,
          "key": "E major",
          "url": "https://mrmrmaker.com/audio/songs/happy-birthday-to-you/-3.mp3",
          "durationSeconds": 67.9
        },
        {
          "semitones": -2,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/happy-birthday-to-you/-2.mp3",
          "durationSeconds": 68
        },
        {
          "semitones": 0,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/happy-birthday-to-you/0.mp3",
          "durationSeconds": 68
        },
        {
          "semitones": 2,
          "key": "A major",
          "url": "https://mrmrmaker.com/audio/songs/happy-birthday-to-you/2.mp3",
          "durationSeconds": 68
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "hark-the-herald-angels-sing",
      "titles": {
        "en": "Hark! The Herald Angels Sing",
        "ko": "천사 찬송하기를"
      },
      "category": "carol",
      "composer": "Felix Mendelssohn",
      "composerDied": 1847,
      "composerTraditionalSince": null,
      "lyricist": "Charles Wesley",
      "lyricistDied": 1788,
      "firstPublished": 1840,
      "originalKey": "F major",
      "keySource": "https://hymnary.org/tune/mendelssohn_mendelssohn",
      "pageUrl": "https://mrmrmaker.com/songs/hark-the-herald-angels-sing",
      "audio": [
        {
          "semitones": -3,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/hark-the-herald-angels-sing/-3.mp3",
          "durationSeconds": 58.1
        },
        {
          "semitones": -2,
          "key": "Eb major",
          "url": "https://mrmrmaker.com/audio/songs/hark-the-herald-angels-sing/-2.mp3",
          "durationSeconds": 58.2
        },
        {
          "semitones": 0,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/hark-the-herald-angels-sing/0.mp3",
          "durationSeconds": 57.9
        },
        {
          "semitones": 2,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/hark-the-herald-angels-sing/2.mp3",
          "durationSeconds": 58.1
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "it-came-upon-the-midnight-clear",
      "titles": {
        "en": "It Came Upon the Midnight Clear",
        "ko": "그 맑고 환한 밤중에"
      },
      "category": "carol",
      "composer": "Richard Storrs Willis",
      "composerDied": 1900,
      "composerTraditionalSince": null,
      "lyricist": "Edmund Hamilton Sears",
      "lyricistDied": 1876,
      "firstPublished": 1849,
      "originalKey": "Bb major",
      "keySource": "https://hymnary.org/hymn/CHMC1927/101",
      "pageUrl": "https://mrmrmaker.com/songs/it-came-upon-the-midnight-clear",
      "audio": [
        {
          "semitones": -3,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/it-came-upon-the-midnight-clear/-3.mp3",
          "durationSeconds": 80.3
        },
        {
          "semitones": -2,
          "key": "Ab major",
          "url": "https://mrmrmaker.com/audio/songs/it-came-upon-the-midnight-clear/-2.mp3",
          "durationSeconds": 80.4
        },
        {
          "semitones": 0,
          "key": "Bb major",
          "url": "https://mrmrmaker.com/audio/songs/it-came-upon-the-midnight-clear/0.mp3",
          "durationSeconds": 80.3
        },
        {
          "semitones": 2,
          "key": "C major",
          "url": "https://mrmrmaker.com/audio/songs/it-came-upon-the-midnight-clear/2.mp3",
          "durationSeconds": 80.3
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "it-is-well-with-my-soul",
      "titles": {
        "en": "It Is Well with My Soul",
        "ko": "내 평생에 가는 길"
      },
      "category": "hymn",
      "composer": "Philip P. Bliss",
      "composerDied": 1876,
      "composerTraditionalSince": null,
      "lyricist": "Horatio G. Spafford",
      "lyricistDied": 1888,
      "firstPublished": 1876,
      "originalKey": "C major",
      "keySource": "https://hymnary.org/tune/ville_du_havre_bliss",
      "pageUrl": "https://mrmrmaker.com/songs/it-is-well-with-my-soul",
      "audio": [
        {
          "semitones": -3,
          "key": "A major",
          "url": "https://mrmrmaker.com/audio/songs/it-is-well-with-my-soul/-3.mp3",
          "durationSeconds": 78
        },
        {
          "semitones": -2,
          "key": "Bb major",
          "url": "https://mrmrmaker.com/audio/songs/it-is-well-with-my-soul/-2.mp3",
          "durationSeconds": 78
        },
        {
          "semitones": 0,
          "key": "C major",
          "url": "https://mrmrmaker.com/audio/songs/it-is-well-with-my-soul/0.mp3",
          "durationSeconds": 77.9
        },
        {
          "semitones": 2,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/it-is-well-with-my-soul/2.mp3",
          "durationSeconds": 77.9
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "jingle-bells",
      "titles": {
        "en": "Jingle Bells",
        "ko": "징글벨"
      },
      "category": "carol",
      "composer": "James Lord Pierpont",
      "composerDied": 1893,
      "composerTraditionalSince": null,
      "lyricist": "James Lord Pierpont",
      "lyricistDied": 1893,
      "firstPublished": 1857,
      "originalKey": "G major",
      "keySource": "https://hymnary.org/hymn/SoS1918/139",
      "pageUrl": "https://mrmrmaker.com/songs/jingle-bells",
      "audio": [
        {
          "semitones": -3,
          "key": "E major",
          "url": "https://mrmrmaker.com/audio/songs/jingle-bells/-3.mp3",
          "durationSeconds": 69.6
        },
        {
          "semitones": -2,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/jingle-bells/-2.mp3",
          "durationSeconds": 69.6
        },
        {
          "semitones": 0,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/jingle-bells/0.mp3",
          "durationSeconds": 69.5
        },
        {
          "semitones": 2,
          "key": "A major",
          "url": "https://mrmrmaker.com/audio/songs/jingle-bells/2.mp3",
          "durationSeconds": 69.6
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "joy-to-the-world",
      "titles": {
        "en": "Joy to the World",
        "ko": "기쁘다 구주 오셨네"
      },
      "category": "carol",
      "composer": "Lowell Mason (arranger)",
      "composerDied": 1872,
      "composerTraditionalSince": null,
      "lyricist": "Isaac Watts",
      "lyricistDied": 1748,
      "firstPublished": 1836,
      "originalKey": "D major",
      "keySource": "https://hymnary.org/tune/antioch_handel",
      "pageUrl": "https://mrmrmaker.com/songs/joy-to-the-world",
      "audio": [
        {
          "semitones": -3,
          "key": "B major",
          "url": "https://mrmrmaker.com/audio/songs/joy-to-the-world/-3.mp3",
          "durationSeconds": 81.1
        },
        {
          "semitones": -2,
          "key": "C major",
          "url": "https://mrmrmaker.com/audio/songs/joy-to-the-world/-2.mp3",
          "durationSeconds": 81
        },
        {
          "semitones": 0,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/joy-to-the-world/0.mp3",
          "durationSeconds": 81.1
        },
        {
          "semitones": 2,
          "key": "E major",
          "url": "https://mrmrmaker.com/audio/songs/joy-to-the-world/2.mp3",
          "durationSeconds": 81.1
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "nearer-my-god-to-thee",
      "titles": {
        "en": "Nearer, My God, to Thee",
        "ko": "내 주를 가까이 하게 함은"
      },
      "category": "hymn",
      "composer": "Lowell Mason",
      "composerDied": 1872,
      "composerTraditionalSince": null,
      "lyricist": "Sarah Flower Adams",
      "lyricistDied": 1848,
      "firstPublished": 1841,
      "originalKey": "G major",
      "keySource": "https://en.wikisource.org/wiki/The_Army_and_Navy_Hymnal/Hymns/Nearer,_My_God,_to_Thee",
      "pageUrl": "https://mrmrmaker.com/songs/nearer-my-god-to-thee",
      "audio": [
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          "key": "E major",
          "url": "https://mrmrmaker.com/audio/songs/nearer-my-god-to-thee/-3.mp3",
          "durationSeconds": 54.6
        },
        {
          "semitones": -2,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/nearer-my-god-to-thee/-2.mp3",
          "durationSeconds": 54.8
        },
        {
          "semitones": 0,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/nearer-my-god-to-thee/0.mp3",
          "durationSeconds": 54.8
        },
        {
          "semitones": 2,
          "key": "A major",
          "url": "https://mrmrmaker.com/audio/songs/nearer-my-god-to-thee/2.mp3",
          "durationSeconds": 54.8
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "o-christmas-tree",
      "titles": {
        "en": "O Christmas Tree (O Tannenbaum)",
        "ko": "소나무야"
      },
      "category": "carol",
      "composer": "Traditional German folk melody",
      "composerDied": null,
      "composerTraditionalSince": 1843,
      "lyricist": "Ernst Anschütz (first verse after August Zarnack, 1820)",
      "lyricistDied": 1861,
      "firstPublished": 1824,
      "originalKey": "G major",
      "keySource": "https://hymnary.org/hymn/ALH1930/618",
      "pageUrl": "https://mrmrmaker.com/songs/o-christmas-tree",
      "audio": [
        {
          "semitones": -3,
          "key": "E major",
          "url": "https://mrmrmaker.com/audio/songs/o-christmas-tree/-3.mp3",
          "durationSeconds": 68
        },
        {
          "semitones": -2,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/o-christmas-tree/-2.mp3",
          "durationSeconds": 68
        },
        {
          "semitones": 0,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/o-christmas-tree/0.mp3",
          "durationSeconds": 68
        },
        {
          "semitones": 2,
          "key": "A major",
          "url": "https://mrmrmaker.com/audio/songs/o-christmas-tree/2.mp3",
          "durationSeconds": 67.8
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "o-come-all-ye-faithful",
      "titles": {
        "en": "O Come, All Ye Faithful",
        "ko": "참 반가운 성도여"
      },
      "category": "carol",
      "composer": "John Francis Wade (attributed)",
      "composerDied": 1786,
      "composerTraditionalSince": null,
      "lyricist": "John Francis Wade (Latin text, attributed)",
      "lyricistDied": 1786,
      "firstPublished": 1751,
      "originalKey": "G major",
      "keySource": "https://hymnary.org/hymn/BH1991/89",
      "pageUrl": "https://mrmrmaker.com/songs/o-come-all-ye-faithful",
      "audio": [
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          "key": "E major",
          "url": "https://mrmrmaker.com/audio/songs/o-come-all-ye-faithful/-3.mp3",
          "durationSeconds": 62.1
        },
        {
          "semitones": -2,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/o-come-all-ye-faithful/-2.mp3",
          "durationSeconds": 62.3
        },
        {
          "semitones": 0,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/o-come-all-ye-faithful/0.mp3",
          "durationSeconds": 62.3
        },
        {
          "semitones": 2,
          "key": "A major",
          "url": "https://mrmrmaker.com/audio/songs/o-come-all-ye-faithful/2.mp3",
          "durationSeconds": 62.2
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "o-come-o-come-emmanuel",
      "titles": {
        "en": "O Come, O Come, Emmanuel",
        "ko": "곧 오소서 임마누엘"
      },
      "category": "carol",
      "composer": "Traditional (VENI EMMANUEL), adapted by Thomas Helmore",
      "composerDied": 1890,
      "composerTraditionalSince": null,
      "lyricist": "John Mason Neale (translator)",
      "lyricistDied": 1866,
      "firstPublished": 1851,
      "originalKey": "E minor",
      "keySource": "https://hymnary.org/hymn/LHTC1918/1",
      "pageUrl": "https://mrmrmaker.com/songs/o-come-o-come-emmanuel",
      "audio": [
        {
          "semitones": -3,
          "key": "C# minor",
          "url": "https://mrmrmaker.com/audio/songs/o-come-o-come-emmanuel/-3.mp3",
          "durationSeconds": 68.2
        },
        {
          "semitones": -2,
          "key": "D minor",
          "url": "https://mrmrmaker.com/audio/songs/o-come-o-come-emmanuel/-2.mp3",
          "durationSeconds": 68.1
        },
        {
          "semitones": 0,
          "key": "E minor",
          "url": "https://mrmrmaker.com/audio/songs/o-come-o-come-emmanuel/0.mp3",
          "durationSeconds": 68.2
        },
        {
          "semitones": 2,
          "key": "F# minor",
          "url": "https://mrmrmaker.com/audio/songs/o-come-o-come-emmanuel/2.mp3",
          "durationSeconds": 68.1
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "o-holy-night",
      "titles": {
        "en": "O Holy Night",
        "ko": "오 거룩한 밤"
      },
      "category": "carol",
      "composer": "Adolphe Adam",
      "composerDied": 1856,
      "composerTraditionalSince": null,
      "lyricist": "Placide Cappeau",
      "lyricistDied": 1877,
      "firstPublished": 1847,
      "originalKey": "C major",
      "keySource": "https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=640",
      "pageUrl": "https://mrmrmaker.com/songs/o-holy-night",
      "audio": [
        {
          "semitones": -3,
          "key": "A major",
          "url": "https://mrmrmaker.com/audio/songs/o-holy-night/-3.mp3",
          "durationSeconds": 120.7
        },
        {
          "semitones": -2,
          "key": "Bb major",
          "url": "https://mrmrmaker.com/audio/songs/o-holy-night/-2.mp3",
          "durationSeconds": 120.7
        },
        {
          "semitones": 0,
          "key": "C major",
          "url": "https://mrmrmaker.com/audio/songs/o-holy-night/0.mp3",
          "durationSeconds": 120.7
        },
        {
          "semitones": 2,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/o-holy-night/2.mp3",
          "durationSeconds": 120.7
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "o-little-town-of-bethlehem",
      "titles": {
        "en": "O Little Town of Bethlehem",
        "ko": "오 베들레헴 작은 골"
      },
      "category": "carol",
      "composer": "Lewis H. Redner",
      "composerDied": 1908,
      "composerTraditionalSince": null,
      "lyricist": "Phillips Brooks",
      "lyricistDied": 1893,
      "firstPublished": 1874,
      "originalKey": "F major",
      "keySource": "https://hymnary.org/tune/st_louis_redner",
      "pageUrl": "https://mrmrmaker.com/songs/o-little-town-of-bethlehem",
      "audio": [
        {
          "semitones": -3,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/o-little-town-of-bethlehem/-3.mp3",
          "durationSeconds": 59
        },
        {
          "semitones": -2,
          "key": "Eb major",
          "url": "https://mrmrmaker.com/audio/songs/o-little-town-of-bethlehem/-2.mp3",
          "durationSeconds": 59.2
        },
        {
          "semitones": 0,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/o-little-town-of-bethlehem/0.mp3",
          "durationSeconds": 59.2
        },
        {
          "semitones": 2,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/o-little-town-of-bethlehem/2.mp3",
          "durationSeconds": 59.1
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "rock-of-ages",
      "titles": {
        "en": "Rock of Ages",
        "ko": "만세 반석 열리니"
      },
      "category": "hymn",
      "composer": "Thomas Hastings",
      "composerDied": 1872,
      "composerTraditionalSince": null,
      "lyricist": "Augustus Montague Toplady",
      "lyricistDied": 1778,
      "firstPublished": 1831,
      "originalKey": "Bb major",
      "keySource": "https://hymnary.org/tune/toplady_hastings",
      "pageUrl": "https://mrmrmaker.com/songs/rock-of-ages",
      "audio": [
        {
          "semitones": -3,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/rock-of-ages/-3.mp3",
          "durationSeconds": 60
        },
        {
          "semitones": -2,
          "key": "Ab major",
          "url": "https://mrmrmaker.com/audio/songs/rock-of-ages/-2.mp3",
          "durationSeconds": 60.1
        },
        {
          "semitones": 0,
          "key": "Bb major",
          "url": "https://mrmrmaker.com/audio/songs/rock-of-ages/0.mp3",
          "durationSeconds": 60.1
        },
        {
          "semitones": 2,
          "key": "C major",
          "url": "https://mrmrmaker.com/audio/songs/rock-of-ages/2.mp3",
          "durationSeconds": 60.1
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "silent-night",
      "titles": {
        "en": "Silent Night",
        "ko": "고요한 밤 거룩한 밤"
      },
      "category": "carol",
      "composer": "Franz Xaver Gruber",
      "composerDied": 1863,
      "composerTraditionalSince": null,
      "lyricist": "Joseph Mohr",
      "lyricistDied": 1848,
      "firstPublished": 1833,
      "originalKey": "Bb major",
      "keySource": "https://hymnary.org/tune/stille_nacht_gruber",
      "pageUrl": "https://mrmrmaker.com/songs/silent-night",
      "audio": [
        {
          "semitones": -3,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/silent-night/-3.mp3",
          "durationSeconds": 65.2
        },
        {
          "semitones": -2,
          "key": "Ab major",
          "url": "https://mrmrmaker.com/audio/songs/silent-night/-2.mp3",
          "durationSeconds": 65.3
        },
        {
          "semitones": 0,
          "key": "Bb major",
          "url": "https://mrmrmaker.com/audio/songs/silent-night/0.mp3",
          "durationSeconds": 65.2
        },
        {
          "semitones": 2,
          "key": "C major",
          "url": "https://mrmrmaker.com/audio/songs/silent-night/2.mp3",
          "durationSeconds": 65.3
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "the-first-noel",
      "titles": {
        "en": "The First Noel",
        "ko": "저 들 밖에 한밤중에"
      },
      "category": "carol",
      "composer": "Traditional English",
      "composerDied": null,
      "composerTraditionalSince": 1823,
      "lyricist": "Traditional English",
      "lyricistDied": null,
      "firstPublished": 1833,
      "originalKey": "D major",
      "keySource": "https://imslp.org/wiki/The_First_Nowell_(Stainer,_John)",
      "pageUrl": "https://mrmrmaker.com/songs/the-first-noel",
      "audio": [
        {
          "semitones": -3,
          "key": "B major",
          "url": "https://mrmrmaker.com/audio/songs/the-first-noel/-3.mp3",
          "durationSeconds": 49.1
        },
        {
          "semitones": -2,
          "key": "C major",
          "url": "https://mrmrmaker.com/audio/songs/the-first-noel/-2.mp3",
          "durationSeconds": 49.2
        },
        {
          "semitones": 0,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/the-first-noel/0.mp3",
          "durationSeconds": 49.2
        },
        {
          "semitones": 2,
          "key": "E major",
          "url": "https://mrmrmaker.com/audio/songs/the-first-noel/2.mp3",
          "durationSeconds": 49.2
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "we-three-kings",
      "titles": {
        "en": "We Three Kings",
        "ko": "동방박사 세 사람"
      },
      "category": "carol",
      "composer": "John Henry Hopkins Jr.",
      "composerDied": 1891,
      "composerTraditionalSince": null,
      "lyricist": "John Henry Hopkins Jr.",
      "lyricistDied": 1891,
      "firstPublished": 1863,
      "originalKey": "E minor",
      "keySource": "https://www.hymnologyarchive.com/we-three-kings",
      "pageUrl": "https://mrmrmaker.com/songs/we-three-kings",
      "audio": [
        {
          "semitones": -3,
          "key": "C# minor",
          "url": "https://mrmrmaker.com/audio/songs/we-three-kings/-3.mp3",
          "durationSeconds": 53.8
        },
        {
          "semitones": -2,
          "key": "D minor",
          "url": "https://mrmrmaker.com/audio/songs/we-three-kings/-2.mp3",
          "durationSeconds": 53.9
        },
        {
          "semitones": 0,
          "key": "E minor",
          "url": "https://mrmrmaker.com/audio/songs/we-three-kings/0.mp3",
          "durationSeconds": 53.7
        },
        {
          "semitones": 2,
          "key": "F# minor",
          "url": "https://mrmrmaker.com/audio/songs/we-three-kings/2.mp3",
          "durationSeconds": 53.6
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "what-a-friend-we-have-in-jesus",
      "titles": {
        "en": "What a Friend We Have in Jesus",
        "ko": "죄짐 맡은 우리 구주"
      },
      "category": "hymn",
      "composer": "Charles Crozat Converse",
      "composerDied": 1918,
      "composerTraditionalSince": null,
      "lyricist": "Joseph M. Scriven",
      "lyricistDied": 1886,
      "firstPublished": 1865,
      "originalKey": "F major",
      "keySource": "https://hymnary.org/tune/converse_converse",
      "pageUrl": "https://mrmrmaker.com/songs/what-a-friend-we-have-in-jesus",
      "audio": [
        {
          "semitones": -3,
          "key": "D major",
          "url": "https://mrmrmaker.com/audio/songs/what-a-friend-we-have-in-jesus/-3.mp3",
          "durationSeconds": 54.8
        },
        {
          "semitones": -2,
          "key": "Eb major",
          "url": "https://mrmrmaker.com/audio/songs/what-a-friend-we-have-in-jesus/-2.mp3",
          "durationSeconds": 54.8
        },
        {
          "semitones": 0,
          "key": "F major",
          "url": "https://mrmrmaker.com/audio/songs/what-a-friend-we-have-in-jesus/0.mp3",
          "durationSeconds": 54.8
        },
        {
          "semitones": 2,
          "key": "G major",
          "url": "https://mrmrmaker.com/audio/songs/what-a-friend-we-have-in-jesus/2.mp3",
          "durationSeconds": 54.7
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    },
    {
      "slug": "what-child-is-this",
      "titles": {
        "en": "What Child Is This?",
        "ko": "왓 차일드 이즈 디스 (그린슬리브스)"
      },
      "category": "carol",
      "composer": "Traditional English (GREENSLEEVES)",
      "composerDied": null,
      "composerTraditionalSince": 1580,
      "lyricist": "William Chatterton Dix",
      "lyricistDied": 1898,
      "firstPublished": 1871,
      "originalKey": "E minor",
      "keySource": "https://hymnary.org/hymn/CCNO1870/XIV",
      "pageUrl": "https://mrmrmaker.com/songs/what-child-is-this",
      "audio": [
        {
          "semitones": -3,
          "key": "C# minor",
          "url": "https://mrmrmaker.com/audio/songs/what-child-is-this/-3.mp3",
          "durationSeconds": 48.1
        },
        {
          "semitones": -2,
          "key": "D minor",
          "url": "https://mrmrmaker.com/audio/songs/what-child-is-this/-2.mp3",
          "durationSeconds": 48.1
        },
        {
          "semitones": 0,
          "key": "E minor",
          "url": "https://mrmrmaker.com/audio/songs/what-child-is-this/0.mp3",
          "durationSeconds": 48.2
        },
        {
          "semitones": 2,
          "key": "F# minor",
          "url": "https://mrmrmaker.com/audio/songs/what-child-is-this/2.mp3",
          "durationSeconds": 48.1
        }
      ],
      "audioLicense": "CC BY 4.0 MR Maker",
      "reviewedAt": "2026-10-10"
    }
  ]
}