I never specifically played music to my bump but i can tell you that certain songs that I listened to frequently during my pregnancy would calm my kids after they were born. With DS2 It happened to be 2 five for fighting songs. Whenever he got really cranky I would play them on my phone or on youtube and he would just get quiet and listen.
I heard that if you repeat one song again and again and every day. Your baby will familiar with the song after he/she is born. And when he/she is crying/can not fall asleep , you can play the same music. Then he/she will easy to calm down and feel comfortable and easy to fall asleep.
ooo i love disturbed :) my bf's always playing metallica to the bump lol
I always played rock and metal to my baby, mostly Tool and Disturbed. She loves to listen to that stuff now and wiggles and smiles whenever it's on.
Lol I don't know about classical music, but my dd would go crazy and kick when lady gaga was on. Now she dances whenever she hears that song. I played classical music very early on after she was born it seemed to help with naps.