Requiem of Spirit

From Zelda Wiki.org

The Requiem of Spirit is a song taught by Sheik at the Desert Colossus in Ocarina of Time and allows Link to warp to the Desert Colossus at any age.
Twilight Princess featured this song as a requirement to learn a Hidden Skill from the Hero's Shade at Gerudo Desert. A requiem is a form of music whose theme is a prayer for the salvation of the souls of the departed, and it is used both at services immediately preceding a burial, and on occasions of more general remembrance.