Prelude of Light

The Prelude of Light is one of six warp songs featured in Ocarina of Time. It transports Link to the Temple of Time (likely because that's the entrance to the Sacred Realm, which is where the Temple of Light is located) whenever the song is played on his ocarina. After he completes the first dungeon as an adult, he can return to the temple to learn this song from Sheik.

In Twilight Princess, Wolf Link can summon the Golden Wolf by howling this song at the Howling Stone in the Sacred Grove.

A prelude is a song written as an introduction to something important.