I like the fact that the book does not talk. It forces me to be extra creative with its expressions and gestures to communicate properly.
However, if it DID have a voice, it would sound like this: http://www.youtube.com/watch?v=qQM4T7BLqKI
I was so happy to hear this song, I've been looking for a Listy themesong forever. It's hard to find songs appropriate for intelligent books.