It took me a little while to figure out what he was singing during "naptime" (HA. HAHA) but I think its pretty obvious here! This song is all over the tv and radio and the cd was on pretty heavy rotation in my car when I first got it. Actually, it still is now that I know he loves it so much!
Here's a link to the song, in case you live under a rock. And don't worry, those "na na na nas" come in towards the end, and milo is pretty darn spot on with those!