Oddly enough, Sonic Boom is the only real song I like from Sonic CD(all music versions), though the American soundtrack is more tolerable than the Japanese one(with all those crappy vocals everywhere). Though, seriously, music-wise, I think Sonic CD was a little too experimental for it's own good. Then again, I can't say I liked any of the music post-S&K. Sonic 1, 2, 3 and S&K are, to me, the definitive sound of Sonic, basically lighthearted themes motif-themed songs mixed in with some techno and freestyle. Oddly enough, most people hated Sonic 4's soundtrack, though I think it came the closest to capturing the style of music seen int he earlier games. The only thing, IMO, that sucked was that the synth was horribly outdated. As that one guy said in the Sonic group discussion(when Sega invited Sonic fans to give feedback about what went wrong with Sonic 4 ep 1), Sega's synth style was like that because they had no choice due to hardware limitations. Had they been given the ability to use real instruments, no doubt they WOULD'VE, which is what they should've strived for with Sonic 4's synth(make it realistic sounding).