Along with the prototype is a lot of different music. Although most of it is the same, each track has something a little different.

Tracks 2 to 24, and track 32 are similar to their final counterpart, but do not fade at the ends.

sonic510_25.mp3 - This supposedly the title screen music in 510, both it and track 26 are the same, both are very different from the final.

sonic510_28.mp3 - This is a very different super sneakers music track to the final, it's a quick, tinny remix of 'Toot Toot Sonic Warrior', the games theme song.

Track 31, which is the special stage music, is 4:31 long, much larger than the final game. This was most likely cut down to fit in the few missing pieces, The Opening, Ending and Time attack themes, into the CD soundtrack.