The Deep End

"The Deep End" is a musical composition by Yoko Shimomura. It is used in the Kingdom Hearts series as a boss theme.

Kingdom Hearts and Kingdom Hearts Final Mix

 * Olympus Coliseum: Rock Titan boss fight, Ice Titan boss fight
 * Agrabah: Kurt Zisa boss fight
 * Atlantica: Giant Ursula boss fight
 * Hollow Bastion: Dragon Maleficent boss fight
 * End of the World: Ansem I boss fight

Cutscenes

 * Agrabah: "Kurt Zisa Appears"
 * Atlantica: "Ursula Becomes Giant"
 * Hollow Bastion: "Maleficent's Power Unlocked"
 * End of the World: "Return to Darkness"

Composition
"The Deep End" is approximately two minutes and fourteen seconds long in Kingdom Hearts and the HD remake of Kingdom Hearts Final Mix. The piece has a time signature of 4/4, and a tempo of 160 beats per minute.

In Kingdom Hearts, the instrumentation includes: a complete strings section- violin, viola, cello, and stringed bass, flute, trumpet, trombone, tuba, crash cymbals, snare drum, bass drum, timpani, and piano. In Kingdom Hearts HD 1.5 ReMIX, the instrumentation includes that of the original Kingdom Hearts, but also adds: clarinet, and harp.

The thick texture of the piece fits its use as a greater boss theme. The underlying percussion and low brass parts lay the initial foundation of intensity. Over this is a changing interplay between trumpet, flute, treble voicing of the piano, and upper strings. This constant revolving of themes only heightens the tension of the piece.