I am 22 weeks pregnant and I'm not sure what music to listen to?

I usually listen to hip pop, but now that I know my baby can hear I don't know if it's such a good idea to listen to that. Does it have any negative effect on him? Should I listen to one particular kiddie song everyday so that my baby gets used to it? Should I stop listening to my type of music? I don't want hip pop to have any effect on him. Please help. I want what's best for my baby boy.