The original C64 soundtrack by Joseph is one of the finest pieces of SID music out there. It is just perfect... most of it is taken from Conan the Barbarian movie sound track, but the feeling is just great. Unfortunetly the ST version doesn't come even close. I have heard great renditions of C64 SID tunes on Amiga before, so maybe someone can do it justice and include it in the game.
Lack of this music is also the reason why I only play Barbarian on C64