Since there isn't nearly enough room in the credits, here's a list of all the custom music in the game and who ported each.

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Levels:

Wigglemunch Hills				
Sonic 3D Blast - Green Grove Zone act 1	
Gamma V



Chuckle Cove					
Super Paper Mario - Tilt Island		
spigmike



Viridian Pass	
Blaster Master - Stage 1			
MarkVD100



Cliffside Campsite
Mario Kart DS - DK Mountain			
Gamma V



Ballistic Boneyard				
Deltarune - Rude Buster			
Ultima



Rotten Hollow		
Ardy Lightfoot - Island of Ruins		
DanTheVP



Forgotten Ruins			
Sonic 3D Blast - Rusty Ruins act 1			
Gamma V



Palace of Light	
Gimmick! - Sophia				
Pinci



Spectral Sanctum	
Last Bible 3 - Felest Tower		
Wakana

Boss 1: Boo			
Wario: Master of Disguise - Count Cannoli			
Wakana



Ricochet Ridge					
Diddy Kong Racing - Spaceport Alpha		
HarvettFox96



Sunburnt Sands					
Mario & Luigi: Partners in Time - Gritzy Desert			
TheInsanity115



Loco Bridge
Sonic CD - Wacky Workbench (Past)		
Ultima



Sunken Mine					
Jurassic Park (SNES) - Triceratops Trot		
Blind Devil



Blackened Badlands
Super Mario RPG - Barrel Volcano			
Sinc-X



Amigara Fault			
Live-a-Live - Silent Labyrinth		
S.N.N.



Palace of Shadow				
Metroid: Zero Mission - Ridley's Lair	
HertzDevil



Twisted Abyss					
Sonic 3 & Knuckles - Sandopolis Zone act 1			
Ultima



Boiling Bastion
Sonic 3D Blast - Volcano Valley act 1		
Gamma V

Boss 2 - Reznor				
Shin Megami Tensei II - Boss		
musicalman



Absolute Zero		
Donkey Kong Country 3 - Water World			
Blind Devil



Galaxy Trail		
Wizardry - Blue Room			
HarvettFox96



Superstar Speedway		
Undertale - Death by Glamour		
Wakana



Somewhere Else (first half)
Silent Hill - Alternate Hospital Basement	
Moose

Somewhere Else (second half)
Deltarune - The World Revolving		
Ultima

Final area				
Rudra No Hihou - Quest for Rudra's Mines	
MaxodeX

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Other music:

Title screen			
Bouncing Ball Trainer - Alternate Theme			
Sinc-X



Intro thingy			
Monkey Island - Chapter Jingle
ggamer77



Base Camp (Yoshi's house)			
Pokemon Ruby/Sapphire/Emerald - Petalburg City			
TheInsanity115



Overworld (main)
Mario & Luigi Superstar Saga - Beanbean Fields		
Masterlink



Overworld (cave)	
Undertale - Ruins					
Sinc-X



Overworld (dark cave)
Donkey Kong Country - Voices of the Temple			
ggamer77



Overworld (special)	
Secret of Evermore - Lonely Halls			
musicalman

