An ear for music

Gabby often takes a nap in my bedroom - when she does, I'll sometimes turn on some music for her. It's usually kids singing Christian songs, or a quiet, soothing jazz cd - that's the one she really likes and requests every time. It's a cd by Norah Jones.
Today she was watching Sesame Street and Norah Jones was a guest on this episode. She started singing a song that Gabby had never heard, and she's certainly never seen what Norah Jones looks like, but as soon as Gabby heard the song, she got excited and said, "That sounds like the girl on the cd in your bedroom!"
So based solely on the sound of her voice, Gabby recognized who it was. Pretty impressive for a 4 year old!