A while ago I was thinking about one of the main things that has changed in the sonic games (aside from the quality) and thought it was as good an excuse as any to make an animation out of
The songs are 8-bit Epic by Benjamin Tibbetts go check his page out, he has some great stuff
As well as Dream Culture, The whip theme and Hush by the always brilliant Kevin MacLeod of http://incompetech.com/