Prelude of Light

The "Prelude of Light" is a recurring song in the, first appearing as a playable melody in Ocarina of Time.

Ocarina of Time
In Ocarina of Time, the "Prelude of Light" is one of the six warp songs Link learns as an adult. Using the Ocarina of Time, it transports Link inside the Temple of Time, likely because that's the entrance to the Sacred Realm, which is where the Temple of Light is located. After the young hero completes the Forest Temple, Link can return to the Temple of Time to learn this song from Sheik. Strangely, this song is actually a conclude, not a prelude (the notes descend from a triumphant feel to a gloomy one).

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

Music Theory of the Prelude of Light
The Prelude of Light is 8 bars long in 4/4 time, and in the key of D Major. Harmonically, the first four bars give the feeling of a church setting by using only I and IV chords, a technique used frequently in Mass settings and known commonly as the "Hallelujah" cadence (or plagal cadence, more properly). The last 4 bars employ the unusual harmonic ending of ii7 - bIIma7 - Ima7 with the last arpeggiated riff in the harp part giving finality to the last I chord and resolving the 7th at the top.