32 weeks, did I wait too long to do this for my baby? please read mommys and mommys to be?

ok well I know I look like a moron right now (well I feel like one)because I'm laying here with a boombox next to my belly playing mozart... (for my baby of course, I'm more of an r&b/pop/hip hop kind of girl myself)this is my first time doing it but I've heard clical music has a positive effect on unborn babies , what are some pros and cons of it? did I wait too late to start? am I doing it the right way, can the baby hear it or would I need special headphones? any experiences? any suggestions?