Sega recently put up the soundtracks to (almost) every major Sonic game on Spotify. If you love listening to Sonic music but are sick of messing around with Youtube playlists then this will be a godsend.
Complete List (so far)
Sonic CD
Sonic R
Sonic Adventure
Sonic Adventure 2
Sonic Heroes
Shadow the Hedgehog
Sonic Rush
Sonic Riders
Sonic 06
Sonic and the Secret Rings
Sonic Riders: Zero Gravity
Sonic Unleashed
Sonic and the Black Knight
Sonic Colors
Sonic Free Riders
Sonic the Hedgehog 4: Episode 1 & 2
Sonic Generations
Sonic & All-Stars Racing Transformed
Sonic Lost World
Nice find! You can also conveniently download even more soundtracks at www.soniczone.net! :P </shilling>