Here's something for all the Zelda continuity conspiracy theorists. FPAwesome was reversing the sound on YouTube videos one day, as we all do when bored, and discovered a big secret in The Legend of Zelda: Skyward Sword'sGDC 2011 trailer. The background music, which sounds at first like a totally original composition, is actually "Zelda's Lullaby" in reverse! GoNintendo extracted just the audio, which you can hear after the break.
Is it a clue about the storyline of Skyward Sword, or is it the work of a playful composer? That's another one for the conspiracy theorists, as is the possibility that the back-masked music is a form of mind control.