If the glitch has already happened, and you are now unable to complete the game, do this:The spoiler is for those of you who haven't beaten the 6th dungeon yet.
Over at Zeldainformer, they have discovered that a game-breaking glitch is possible in the Song of the Hero portion of Skyward Sword. What I mean is that this glitch could potentially cause you to not be able to finish the game. The glitch is somehow related to the Thunder Dragon's Quest. You are supposed to be able to gain the 3 portions of the song of the hero in any order; however, a glitch has occurred to those who have completed the Thunder Dragon Quest prior to either of the other ones. This glitch prevents one of the other 2 portions of the quest to begin and so you cannot finish the game. Keep in mind that the exact reason for this glitch occurring are still unknown. Also I believe that some people have been able to do the Thunder Dragon Quest first without experiencing problems, but no one has experienced problems by doing it last.
So play it safe and save (preferably to another file as well) before doing any of the 3 portions of the quest, and beware if you plan on doing the Thunder Dragon portion before either of the other two.
Same here, the glitch is really highly unlikely if you do not try to provocate it, just like the one in twilight princess where you saved your game at just the wrong time.I did it in the sequence Faron, Eldin, Lanayru.
Just kind of seemed natural to do it that way, considering that is usually how all Zelda games are set up.
I did it on my own, without information of a glitch.