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That would be cool if you can get into a warthog and it plays the radio - It could play your custom soundtrack in a low volume . But only cool if in mulitplayer - not the campaign mode.
I think it would be cool, it would be sorta like battlefield bietnam where the helicopters play music and you can hear it in the distance and stuff
i hope there are custom soundtracks in halo 2. it would give you the option of listening to your favorite music or listening to the kick-ass halo 2 music.