On Dragonroost it's the little girl bird that helped you out on your way to fight the dragon, the other one is on the Great Tree island, it's the little deku guy that plays the fiddle.
Hmm, well the little deku makes sense, I forgot all about him. But as far as the little girl bird, I don't recall her even playing any instruments. Bleh, what a lame part of the game, I was doing so well up until this point. Thanks so much for the help though, I always have a guilt trip when I check a strategy guide for help, I feel much better about getting hints from you guys.