Haha the Viva Piñata music (in particular the one that I supposed now is unofficially dubbed "Edison's Theme") always reminded me of the music from "Babar".
http://www.youtube.com/watch?v=8UFIeHBvDpA
But indeed, I am very excited about this! It's like "The Beatles Anthology" being released and you got to hear all of the rough versions of lovable tunes and see what turned into what and so forth. Would be great if Grant decided to add some descriptions and backstory to what the tunes started out as.