This of mod adds music in interiors Andreas's Dignity as it was in GTA 4. When you will be is in any interior, different music will always play. While I have added music only in an interior of the house of Charles which is given to us from the very beginning of game.
http://www.youtube.com/watch?v=G3PA88g6Q70
It's a kind of easy mod i did it myself like 3 months before, too. But sadly, you cannot set user tracks player or at least fav. radio station in savehouses...