Primus singer, bassist Les Claypool wrote the original theme track and four other themes for upcoming Wii romp Mushroom Men, Billboard reports.

This is Claypool’s first game to set music too, though he’s created themes for both South Park and Robot Chicken as well as a number of movies.

The idea to approach Claypool about scoring came from Kris Taylor, co-founder and art director of Red Fly Studio, and a huge fan of Claypool and his band, Gamecock’s Mike Wilson told me. Billboard misreported that the impetus came from Ryan Mattson. Wilson said that Taylor built his own Claypool-style bass, which thoroughly impressed the musician during his visit to Austin in March.

For Claypool, a fanatic mushroom hunter who has a gaming son, the decision was an easy one.