Just a heads up that you can override all music in the game via the Xbox Guide's Music Player. It's essentially the same as the Music Player found in the Dashboard, so you can use any media source (hard drive, external device and network streaming).

Custom music plays at all times, regardless of whether Niko is in a vehicle or on foot or in a cutscene. If you want to change tracks you'll need to do it via Guide, just be sure to pause first since Rockstar Games didn't implement auto-pause! Radio stations logos don't display until you release music control to the game.

I find it best to just set up a playlist and set it to shuffle.

I'd love to be able to use this feature, but only if it plays in the car. I like having my own music, but not so much when I'm running around. I think it's great to hear the sounds of the city when you're on foot.

Agreed. It's a shame this wasn't implemented properly. Saints Row did it quite well. Even game demos pause custom music when it's not supposed to playing!

I say bring on IV 1.01