You can play whatever you like, personally I play country because my son always seems to get jiggy with it when I do lol and I've noticed when certain pop songs come on he kicks and moves alot too. But I guess if you want your baby to calm down play soothing music or sounds.
I'll start the Mozart and see how that goes thank yoy
U can play Mozart or batch. Just go to YouTube. It's relaxing and helps to sooth them. My lil princess loves music
I always did calming mostly jack Johnson