One more mashup of the Sonic CD soundtracks coming your way. This one is pretty smooth, I think, with the exception of the Japanese Present track. It has a bit of swing to it, where the rest of the tracks ae very straight in their rhythms. Hopefully the difference isn't too pronounced when listening to it.
This mashup uses tracks from the 2011 release of Sonic CD, the v0.51 beta version of the Past theme containing some more pronounced instruments, and tracks from the Sonic the Hedgehog: BOOM soundtrack; and was composed in Mixcraft 8 Pro Studio. Ripped sprites for the thumbnails were taken from The Spriters Resource.