Topic: Dynamic Music??

I've always wondered why there isn't an option for this included in more games, you know where you could just upload and choose the music you wanted to play during a game, I know it wouldn't make sense in all games and not all devs would like it as they invest heavily in their audio (especially Nintendo) but for the majority I think it could add something unique to the gameplay and add to the replayability, it would probably go a long way to making GTA IV more memorable as radio tunes with all the driving around in cars but it could also go a long way to improving some RPGs with your favourite classical tracks playing in the background I also think there could be some comedy value to be had here, What about slicing your way through the action scenes in the new Wolverine game whilst listening to Simon & Garfunkel's scarborough fair.
What do you think.