I forgot to mention, but she's been recognizing melodies for a couple of months now. Of course she can't talk or sing along, but all the ones with hand motions or anything, I can pick out on a guitar or piano and she instantly recognizes them and does the motions.

We had noticed before that she would start doing the motions before the song even started - the videos have a title screen with the name of the song, and they read it aloud, but no tune or visual hints, and she recognizes the words and starts the motions.

I was playing with her today and found she knows lots of objects. I asked her to bring the basketball, the pencil, santa squid, and the big-eyed kitty (those last two, some of her stuffed toys), and she was all over that.