Does anyone know if the soundtrack CD "Gunstar heroes music collection" contains the music from the mega drive game

Yes.   

01~33: from Game Boy Advance version "Gunstar Super Heroes"
34~58: from Mega Drive version "Gunstar Heroes"
59: Bonus Track

http://www.gmronline.com/info.asp?CatNumber=SCDC-00470
check link for details

Excellent, I just bought this new and I wasn't going to open the seal if there wasn't the mega drive stuff on it