The Key

The Key is a musical composition by Yoko Shimomura that appears in the Kingdom Hearts series.

Appearances
"The Key" appears in both cutscenes and boss battles. It is used in climatic moments, especially scenes related to Keyblades or the χ-blade.

Ventus's Story

 * Badlands: "Former Master", "Seeking the Truth"

Aqua's Story

 * Keyblade Graveyard: Ventus-Vanitas

Kingdom Hearts Union χ

 * Daybreak Town (Main Story): "Fall to Darkness", "Separated"
 * Keyblade Graveyard: "Luxu's War", "As the Bells Toll"

Kingdom Hearts 0.2 Birth by Sleep -A Fragmentary Passage-

 * Dark World: "Keyblade of Darkness"

Kingdom Hearts III

 * Scala ad Caelum: "Stairway to the Sky"

Kingdom Hearts III Re Mind

 * Scala ad Caelum: "Our Hearts Connect as One"

Kingdom Hearts Dark Road

 * Scala ad Caelum: "Two Kinds of People"

Kingdom Hearts Melody of Memory

 * "KINGDOM HEARTS Birth by Sleep: Chapter 4"

Albums
 File:Kingdom Hearts Birth by Sleep and 358 2 Days Original Soundtrack Cover.png|Disc 2, Track 22 in the Kingdom Hearts Birth by Sleep & 358/2 Days Original Soundtrack 