From This Might Be A Wiki

Hmm.. I received 2 versions of the MitM soundtrack. On one of them, the early version of Clap Your Hands is labeled as Mysterion and the finger snapping song as Four Track Mind. On the other one, it's the other way around. I'm not sure which is which. - Wout

The Clap Your Hands one is actually even more 4-track like, starting off with a drumbeat, adding a vocal layer, a guitar layer and finally horn layer (much like the actual Clap Your Hands). - Wout
Gonna switch these back around: 1) the version with Mysterion = Clap your hands has other songs mislabeled as well 2) it corresponds with the description before I edited it. - Wout