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The icon for Kingdom Hearts 0.2 Birth by Sleep -A Fragmentary Passage-
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The Key

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Kingdom Hearts Birth by Sleep
The Key
Theme Notes.png
Arranger Yoko Shimomura
Composer Yoko Shimomura
Length 2:40

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


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

Kingdom Hearts Birth by Sleep[edit]

Ventus's Story[edit]

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

Aqua's Story[edit]

Kingdom Hearts Union χ[edit]

  • 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-[edit]

Kingdom Hearts III[edit]

Kingdom Hearts III Re Mind[edit]

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

Kingdom Hearts Dark Road[edit]

  • Scala ad Caelum: "Two Kinds of People"

Kingdom Hearts Melody of Memory[edit]

  • "KINGDOM HEARTS Birth by Sleep: Chapter 4"