For more fantasy'ish RPG's it's not unthinkable to have tunes up to 8 minutes (there're tunes of that size in Diablo 2/exp). That would eat up a whopping 80MB, not exactly a number I'd wish for..
Would it not be possible to create an audio system that streams or decompresses files on the fly for memory-related issues in those cases?
(would be a balancing act between CPU & RAM from the looks of things...)