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Cause i've heard u can.
yepyou just start your music in windows meidia or whatever and then start the gamepress ALT+TAB to switch windows without Quitting so you can change the song and such
don't forget; in halo PC, go to settings--->audio, and turn game music to off. otherwise, it'll just be a mess of sound[Edited on 12/20/2004 7:08:20 PM]
there might be another way...using HMT, to get your music to que when the halo music would. just tell me al level, and i'll try to figure out how to change the music