Added Casual parts 1 and 2, actually working drums for it, and a solo version.

Added Collective lead and drum parts.
The drums sound awful on their own, but I didn't feel right leaving them out entirely.
Added higher quality preview image, in case anyone wanted that.
Also, updated it correctly this time!

Sorry if you saw this get uploaded and then taken down.
Messed up my first update. Yay.