Muzica is the second planet on the trip to Zythurvia in MarioMario54321's Super Mario 64 Bloopers movie The Cosmic Crystals IV: Zythurvia. It's filled with Music Notes and Keyboards, amongst other musical stuff. It had a Crystal Comet Medal and the pink Zyther Crystal. It's one of Geminon's favourite planets on the road to Zythurvia.
It's mainly a reversed retextured version of Whomp's Fortress and Tick Tock Clock, where the boss is the Song-omp King, which a huge tower with the Crystal Comet Medal appears in place of after Wockyjet defeats him for Luigi. The Crystal Comet challenge was a daredevil run against him, where Wockyjet also defeated him for Luigi.
The music is Music Plant from Sonic Advance 2.