Minecraft 1.21.7-rc1
A surprise “hotfix” release candidate. See the changelog.
Music Disc
The Lava Chicken music disc can only be dropped by a regular baby zombie (not Husks, Drowned, or other variants) which is currently riding a chicken. Killing the chicken first, then the baby zombie does not drop the disc.
The music disc plays for 2:14 and has a comparator output of 9.