I play Christian children songs...any song is good...don't need to be classical music. Youtube got a lot of suggested play list and u might want to create a few favorites to play those few favorites more often for the "familiar songs" that baby will recognize when born
They said baby mozart is good. but i always fell asleep listening to it. hahaha. So i just listen to whatever song i feel like it
I listen to baby deep sleep music on YouTube. Find one which you like.
Baby Mozart :)