Great play! Loved it
The stems (most of the site) come from RockBand. This is from RockBand 2 (that's where the RB2 stands for).
GH is from Guitar Hero.

I've seen some fun stems on there. Thanks for the website. I was going to do a few of those, but then I decided to make a deep cut in the top of my left middle finger with a sharp knife so now I can't play since it hurts like hell ...