I'm not an expert or anything, but I have a couple of thoughts. First, I wouldn't play music all the time. I think our kids are generally overstimulated, and some quiet, peaceful time isn't really a bad thing. Second, I would mix up the music! Play all kinds and see what works best. Don't limit yourself to just kid music, or just classical music... Get on itunes and buy some reggae, some kid-friendly rap, some polka - who knows!! the sky is the limit. the more you expose them to now, the better, I think! Have fun!