Oh wow. Thats a hard one. My ipod has 200 skyward sword songs on it bu i guess the ones i enjoy most are
Ballad of the Goddess (listening to it right now XD)
Sailing the sand sea.
Keep in mind, i LOVE all the songs. This is just based on what i listened to the most this week. I love all the songs equally! The ones i listen to depend on what im learning to play on piano and/or my mood.