What music/songs are best to expose the baby to in the uterus?

I need mostly soothing/calming things as i've already put plenty of Mozart on my Media Player for the baby to listen to (He loves it,btw,kicks the crap out of me every time i turn it on,lol) but i guess some other exciting/fun/dramatic music would be ok too.But if you know of any that have shown studys of positively affecting the baby (like how studys show baby's who listen to Mozart tend to be more intelligent/creative then baby's who don't) then please recommend!!! Thanks so much ^-^