[quote name='felixlighter']Don't waste the HDD space you can used Windows Media Connect and stream audio from your PC or if you have an Ipod or other MP3 player connect that to the Xbox 360.
Personally, I think music is a strong point for the Xbox 360 if you're streaming from your PC or MP3 player. It's the only console of this generation that can currently handle custom sound tracks for every game. However, what Microsoft does need to do is add rewind and fast-forward to their music player. How can you leave out fast-forward and rewind?[/QUOTE]
Personally I'm opposed to "custom soundtracks". IMO it's insulting to composers and game designers, and in some cases could screw up the gameplay.
If you really want custom audio-just turning on a seperate device makes much more sense IMO.
Regardless, I'd never store that type of thing on a game system. As said, just keep it on your PC or iPod (though I just play it from those even when I want separate audio).