Custom Music Disc Addon - install BOTH ways so the full audio plays:

1) Resource Pack: drop this .zip into .minecraft/resourcepacks/ and enable it.
2) Data Pack: also drop this same .zip into your world's datapacks folder
   (<world>/datapacks/). On servers, the admin installs it there.

Without the datapack half, Minecraft 1.21+ will still cut the track at the
vanilla disc length.
