Avery is the most rabid fan, ever, of the Hokey Pokey.
She figured where in the pre-programmed song rotation on her keyboard this song is, and immediately goes there whenever she turns the thing on. Also, her teachers at school say they have never seen a kid respond to that song the way she does. (She apparently will jump up out of her seat or run across the room and stop whatever she is doing and scream, "MY song" and start dancing whenever she hears them play it in the classroom.)
Best part? She calls it the "okey dokey."