Due to the large list of songs used/replaced for the description to be healthy, the layout of songs will be found here;

intermission - Crystal Island
shop - Find the Gobbo! (Bonus)
intro, intro01, intro02 - Title Theme
splash - Level Complete!
minotaur00 - Bonus Room

mines00 - Fight Night with Flibby
mines01 - Cave Fear
mines02 - The Curvy Caverns
mines03 - And So The Adventure Begins... (Caves)
mines04 - Shoutin' Lava Lava Lava (Caves)
minetown - The Twisty Tunnels

swamp00 - Chumly's Confrontation
swamp01 - Riot Brrrrr
swamp02 - Say No Snow
swamp03 - Chumly's Snow Den
temple - Demon Itsy's Ice Palace

labyrinth00 - Desert Jello Bouncing
labyrinth01 - The Desert Caves
labyrinth02 - Mud Pit Mania
minotaur01 - Lights! Camel! Action!

ruins00 - Cactus Jack Clash
ruins01 - Dungeon of Defright
ruins02 - Jailhouse Croc
library - Ballistic Meg's Fairway
herxboss - Baron Dante's Funky Inferno - Phase 1
endgame - Staff Credits

underworld00 - Sand and Freedom
underworld01 - Leap of Faith
underworld02 - Bigger Leap of Faith
hell00 - Baron Dante's Funky Inferno - Phase 2
hell01 - Fosley's Freaky Donut
hell02 - Swipe Swiftly's Wicked Ride
devil - Bout With Demon Itsy
escape - Cactus Jack's Ranch

caves00 - Scuffle with Neptuna
caves01 - Darkness Descends (Underwater)
caves02 - The Deadly Tank of Neptuna
citadel00 - Fight with Fosley
citadel01 - Tower of Power
citadel02 - Hassle in the Castle
sanctum - Baron Dante's Funky Inferno - Phase 3

This mod also makes a single alteration to the sound file;
Death - Game Over