Boss Music

Boss Music is used numerous times in the Kingdom Hearts series to indicate that the current battle is with a Boss. Most Boss Music is fast-paced and sends a theme of Evilness. Usually the same song would be used over different Boss battles to show the connection between them, i.e Shrouding Dark Cloud is associated with Heartless Bosses and Squirming Evil is used commonly for (Basic) Disney Bosses.

Awakening

 * Darkside = Dive into the Heart (Destati)

Destiny Islands

 * Darkside = Destiny's Force

Traverse Town

 * Leon = Night of Fate


 * Guard Armor = Shrouding Dark Cloud


 * Opposite Armor = Destiny's Force

Wonderland

 * Card Soldiers and Crank Tower = To Our Surprise


 * Trickmaster = Shrouding Dark Cloud

Olympus Coliseum

 * Cloud = Shrouding Dark Cloud


 * Cerberus = Squirming Evil


 * Hades = Squirming Evil


 * Rock Titan = The Deep End


 * Ice Titan = The Deep End


 * Sephiroth = One-Winged Angel (from Final Fantasy VII)

Deep Jungle

 * Sabor = Having a Wild Time


 * Clayton and Stealth Sneak = Squirming Evil

Agrabah

 * Pot Centipede = Shrouding Dark Cloud


 * Cave of Wonders Guardian = Arabian Dream


 * Jafar (1st Battle) = Squirming Evil


 * Jafar (2nd Battle) = Destiny's Force


 * Kurt Zisa = The Deep End

Monstro

 * Parasite Cage = Shrouding Dark Cloud

Atlantica

 * Ursula (1st Battle) = Squirming Evil


 * Ursula (2nd Battle) = The Deep End

Halloween Town

 * Lock, Shock and Barrel = Spooks of Halloween Town


 * Oogie Boogie (1st Battle) = Squirming Evil


 * Oogie Boogie (2nd Battle) = The Deep End

Neverland

 * AntiSora = The Deep End


 * Captain Hook = Squirming Evil


 * Phantom = The Deep End

Hollow Bastion

 * Riku (1st Battle) = Scherzo Di Notte


 * Maleficent (1st Battle) = Squirming Evil


 * Maleficent (2nd Battle) = The Deep End


 * Riku (2nd Battle) = Forze del Male


 * Behemoth = The Deep End

End of the World

 * Chernabog = A Night on the Bare Mountain


 * Ansem (1st Battle) = The Deep End


 * Darkside = Destiny's Force


 * Ansem (2nd Battle) = Forze del Male


 * World of Chaos = Guardando Nel Buio

Hollow Bastion

 * Unknown = Disappeared

Traverse Town

 * Guard Armor = Struggle Away

Wonderland

 * Card Soldiers = To Our Surprise


 * Trickmaster = Stuggle Away

Olympus Coliseum

 * Cloud = Go For It!


 * Hades = The Fight for my Friends

Agrabah

 * Jafar = The Fight for my Friends

Monstro

 * Parasite Cage = Struggle Away

Halloween Town

 * Oogie Boogie = The Fight for my Friends

Atlantica

 * Ursula = The Fight for my Friends

Neverland

 * Captain Hook = The Fight for my Friends

Hollow Bastion

 * Maleficent = The Fight for my Friends

Destiny Islands

 * Darkside = Struggle Away

Twilight Town

 * Vexen (2nd Battle) = The 13th Struggle

Castle Oblivion

 * Axel (1st Battle) = The 13th Struggle


 * Larxene (1st Battle) = The 13th Struggle


 * Riku Replica (1st Battle) = The Force in You


 * Riku Replica (2nd Battle) = The Force in You


 * Vexen (1st Battle) = The 13th Struggle


 * Riku Replica (3rd Battle) = The Force in You


 * Riku Replica (4th Battle) = The Force in You


 * Larxene (2nd Battle) = The 13th Struggle


 * Axel (2nd Battle) = The 13th Struggle


 * Marluxia (1st Battle) = Graceful Assassin


 * Marluxia (2nd Battle) = Scythe of Petals

Hollow Bastion

 * Maleficent = The Fight for my Friends

Traverse Town

 * Guard Armor = Struggle Away

Agrabah

 * Jafar = The Fight for my Friends

Monstro

 * Parasite Cage = Struggle Away

Neverland

 * Captain Hook = The Fight for my Friends

Wonderland

 * Trickmaster = Struggle Away

Olympus Coliseum

 * Hades = The Fight for my Friends

Atlantica

 * Ursula = The Fight for my Friends

Halloween Town

 * Oogie Boogie = The Fight for my Friends

Destiny Islands

 * Darkside = Struggle Away

Twilight Town

 * Riku Replica (2nd Battle) = The Force in You

Castle Oblivion

 * Vexen = The 13th Struggle


 * Riku Replica (1st Battle) = The Force in You


 * Lexaeus = The 13th Struggle


 * Ansem = Revenge of Chaos

Castle Oblivion

 * Marluxia (3rd Battle) = Lord of the Castle

Destiny Islands

 * Zexion = The 13th Struggle

Awakening

 * Twilight Thorn = Tension Rising

Simulated Twilight Town

 * Axel (1st Battle) = The 13th Struggle


 * Axel (2nd Battle) = The 13th Struggle

Hollow Bastion

 * Demyx (2nd Battle) = The 13th Dilemma


 * Battle of the 1000 Heartless = Sinister Shadows


 * Sephiroth = One Winged Angel (For Final Fantasy VII)

Land of Dragons

 * Shan Yu = The Encounter


 * Storm Rider = The Corrupted

Beast's Castle

 * Thresholder and Possesser = Dance to the Death


 * The Beast = Tension Rising


 * Shadow Stalker = Dance to the Death


 * Dark Thorn = Desire for All That Is Lost

Olympus Coliseum

 * Cerberus = Vim and Vigor


 * Demyx (1st Battle) = Tension Rising


 * Pete (1st Battle) = Rowdy Rumble


 * Hydra = Vim and Vigor


 * Hades = The Encounter

Timeless River

 * Pete (2nd Battle) = Rowdy Rumble


 * Pete (3rd Battle) = Desire for All That Is Lost

Port Royal

 * Captain Barbossa and The Illuminator = The Encounter


 * Grim Reaper = The Corrupted

Agrabah

 * Volcanic Lord and Blizzard Lord = Vim and Vigor


 * Jafar = The Encounter

Halloween Town

 * Prison Keeper and Lock, Shock and Barrel = Dance to the Death


 * Oogie Boogie = The Encounter


 * Lock, Shock and Barrel = Rowdy Rumble


 * The Experiment = The Corrupted

Pride Lands

 * Shenzi, Banzai and Ed (1st Battle) = Rowdy Rumble


 * Scar = The Encounter


 * Shenzi, Banzai and Ed (2nd Battle) = Rowdy Rumble


 * Groundshaker = The Corrupted

Space Paranoids

 * Hostile Program = The Corrupted


 * Sark and the MCP = The Encounter

The World that Never Was

 * Xigbar = The 13th Dilemma


 * Luxord = The 13th Struggle


 * Saïx = The 13th Dilemma


 * Xemnas = Disappeared


 * Xemnas (Armor I) = A Fight to the Death


 * Xemnas (Dragon) = Darkness of the Unknown


 * Xemnas (Armor II) = A Fight to the Death


 * Xemnas (Final) = Darkness of the Unknown

Disney Castle

 * Lingering Sentiment = Rage Awakened

Hollow Bastion

 * All Absent Silhouettes = The 13th Refection


 * Xemnas Data Battles = Disappeared and Darkness of the Unknown


 * Xigbar, Xaldin, Saïx and Demyx Data Battles = The 13th Dilemma


 * Vexen, Lexaeus, Zexion, Marluxia and Larxene Data Battles = The 13th Reflection


 * Axel and Luxord Data Battles = The 13th Struggle


 * Roxas Data Battle = The Other Promise