Most of these tracks are featured in Sonic Generations in some way. A few of them are "upgraded" remixes (Angel Island, Mushroom Hill, and Toxic Caves for sure). I wonder what's on this disc, the new mixes or the original tracks? When somebody gets ahold of this CD, maybe they can let us know?
The composers listed for the Sonic 3 and Sonic & Knuckles tracks make me sad. Will that mystery ever be solved?