T.K.
Hi J.!
My son loved (and still loves) books that make music. They have a ton at Target for $7.99. And an Elmo one I got at Babies R Us that also has a mirror on it. He LOVES it.
He also loved "touch" books; you know the ones that have different textures to touch and feel. He also likes "Chica Chica Boom Boom"; I think it's because it's more sing songy.
Also remember, babies love repetition! It's how they know the world is safe, and reliable. As old and tiring the same thing over and over is to us, it's safe, stable, and comforting for baby. I still read the same music book to my son now (almost 14 months) as I did when he was a few months old.
Happy reading!!