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Diablo1
The main place i got most of the links is here:
http://downloads.khinsider.com/?u=402535
http://downloads.khinsider.com/game-soundtracks/album/diablo-1
Diablo2 soundtracks at arreat summit
http://www.battle.net/diablo2exp/mp3/
and some alternate links in case those don't work:
http://downloads.khinsider.com/game-soundtracks/album/diablo-ii-lord-of-destruction-original-soundtrack
http://downloads.khinsider.com/game-soundtracks/album/diablo-ii-original-soundtrack
Hope that helps. Enjoy.