Music Playing in worng spot
Go to level one, and get a really fast car (like Mr.Burns Limo, of course completing the game first).
In the Power Plant, try and get a Hit and Run before you enter the fancy hall leading to the "Rich People" area.
The Police Music will sound and get out of the cave.
Once you avoid them, the music that was supposed to play in the fancy hall will play now.
This may not work for some people though.
We have more cheats and tips for this game here, The Simpsons: Hit & Run cheats
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