This are the songs used in each boss fights:
Jewel Ghoul
0:00 Calzonification
Freako Dragon
2:33 Pumpin' Hot Stuff
4:17 Distasteful Anchovies
4:40 World Wide Noise
Ring-a-Ding
5:50 Impasta Syndrome
7:34 Extraterrestrial Wahwahs
9:37 Pillar John's Revenge
Satan
11:55 Unexpectancy part 1
14:05 Unexpectancy part 2
17:53 Unexpectancy part 3
22:08 Unexpectancy part 3.5
23:05 Time for a Smackdown!
Extras
-Boss Defeated
-AOSTH Dr. Robotnik's theme
-Super Mario 64 - Ultimate Bowser
-hmmm look what u done did you found a secret