We were driving to Lowes tonight and the world cafe music show was playing on the radio. They had some pretty hard rock songs (aka not "they might be giants") and the girls asked for to turn it off. As the car got quiet, Aleah began to sing, "Welcome to my nightmare." By Alice Cooper!
Turns out he was a guest on the muppet show dvd she had watched.
A little scary how much they absorb.