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 = Shrouding Dark Cloud

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


 * Unknown = Disappeared

End of the World

 * Chernabog = A Night on the Bare Mountain


 * Ansem (1st Battle) = Guardando Nel Buio


 * Darkside = Destiny's Force


 * Ansem (2nd Battle) = Guardando Nel Buio


 * World of Chaos = Guardando Nel Buio

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


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

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


 * Zexion = The 13th Struggle

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

Kingdom Hearts II

 * Tension Rising - Twilight Thorn, Demyx (First Battle), Beast The Nobodies;
 * The 13th Struggle - Axel, Luxord, Riku, Axel, Luxord,
 * Desire for all that is lost - Dark Thorn, Hydra, Pete in Timeless River (Second Battle), Volcanic Lord and Blizzard Lord,
 * Vim and Vigor - Shan-Yu, Cerberus, Captain Barbossa and Illuminator;
 * Dance to the Death - Thresholder/Possessor, Shadow Stalker, Prison Keeper, The Heartless;
 * Rowdy Rumble - Pete in Olympus Coliseum (First Battle), Pete (?), Lock, Shock, and Barrel, Shenzi, Banzai, and Ed, Hades (First Battle);
 * The Corrupted - Hostile Program, Storm Rider, Grim Reaper, The Experiment, Groundshaker;
 * The 13th Dilemma - Demyx (Second Battle), Xaldin, Xigbar, Saïx, Demyx, Xaldin, Xigbar;
 * The Encounter - Oogie Boogie, Hades (Second Battle), Scar, Jafar (Genie), Master Control Program and Commander Sark;
 * Disappeared - Xemnas
 * A Fight to the Death - Xemnas (Armor);
 * Darkness of the Unknown - Xemnas (Dragon), Inexistent World;
 * Sinister Shadows - Battle of the 1000 Heartless, The Nobodies and Sark.