Can some up the past soundtracks they are the best from the game. US and japan versions if you got em.

http://sonic.planets.gamespy.com/1993_sonic_cd/music.php
This site has the past songs and says the U.S. and japan versions are the same.
EDIT: this link might be better, slow downloads though.
http://www.thesonicworld.net/music_mp3_scd_japan.php