In a recent edition of Iwata Asks, Mr. Iwata managed to get some information out of Koji Kondo, who you may know as the genius behind many of our favorite gaming songs. Most of the details were kept to a minimum but Iwata was able to get some information our of Kondo about the songs that are being worked on for the upcoming Skyward Sword.
Though no full details were released on what songs were being worked on for Skyward Sword, Mr. Kondo and Yokota did have a discussion on the matter and Yokota stated that there were many songs from past games in the series that he wants to orchestrate. He stated that he chose some of his favorites and has put them into Skyward Sword.