💽 Jukebox Song

caution

Due to the fact that Minecraft's registry becomes immutable once registered, you will need to rejoin the server in order to apply any new modifications.

jukebox_songs:
  default:credits_music:
    sound: minecraft:music.credits
    length: 100.0  # music length in seconds
    description: "Credits"  
    comparator_output: 15
    range: 32

Just add the minecraft:jukebox_playable component, and your item becomes a playable music disc

items:
  default:music_stick:
    material: stick
    data:
      jukebox_playable: default:credits_music

If you don't know how to customize a sound, please refer to this page.