Song of the Hero

The "Song of the Hero" is a playable song in Skyward Sword. It serves as a key to the final Silent Realm, played in a duet with Fi and Link, the former with vocals and the latter with Zelda's harp. The full song contains parts from the classic Zelda theme.

Learning Location and Uses
The "Song of the Hero" is split into four parts. Three of the parts are learned from each of the dragons protecting the three regions of The Surface: Faron, Eldin, and Lanayru. The fourth part is learned from Levias in Thunderhead. Once Link learns the full song, he must play it in the plaza in Skyloft to enter the final Silent Realm and open the way that leads to the Triforce.

Glitch
There is an infamous glitch during the quest that prevents the player from completing the game. To activate the glitch, Link must complete Lanayru's part of the song before completing Faron and/or Eldin. After that, if Link talks to Golo in the Lanayru Mine, he will be unable to start the quest in Faron or Edlin. If the player saves at this point, the game cannot be completed normally.

To avoid the glitch, Link can either:
 * Complete Lanayru's part of the song last; or
 * Avoid talking to Golo in the Lanayru Mine. However, talking to him in the Lanayru Caves will not trigger the glitch.

If the player does save after activating the glitch, they can recover their game by using the Save Data Update Channel.

Trivia

 * The Song of the Hero contains both the original The Legend of Zelda theme and the opening notes of the Hyrule Field theme from Ocarina of Time.