The AU is counted if they primarily go by the 1 to 101 structure and have either completed a majority of their soundtrack or still continuing.

AU Soundtracks in Order:
Remix Soundtracks (e.g. Undertale's music redone)
Roleswap Soundtracks (e.g. Underswap)
Atmosphere Change Soundtracks (e.g. Underfell)
Role/World Change Soundtracks (e.g. Recognized Maniacs)
Joke Soundtracks (e.g. Recognized Maniacs)

whole-soundtrack undertale aus

UMBRATALE Soundtrack (In Order)

Not much to say for this one. It was fun experimenting with the composition.

001 - Once Upon A Time

"A long time ago, two races dominated the world:
HUMANS and MONSTERS."
"Then one day, a war has been declared between the two races."
"After a long battle, turns out the humans were victorious."
"They sealed the monsters away with a magic spell."
"A magic spell that makes monsters trapped inside the underground, for a long time."
"Many years, later..."
"MT. SERECH, 200X."
"Rumors said that those who ever climbed the mountain,"
"... Will never come back."

001. A Beginning

In A Land Far Away

1 - Shadow's Edge

2 - Start Menu

3 - A Blossoming Partnership

* Ahuhuhuhu...
* What do we have here?
* You're lucky I was here to save you from that yucky flower, you know~
* After all, I do believe those pellets would ruin your texture.
* ...Oh, pardon me. Where are my manners?
* I am Muffet... the one who watches over the halls of Iciclus.
* It gets quite lonely down here, so I'm just ticked to have a visitor~

4 - Arachnid!

* (The cold air nips at your fingers.)
* (Still, your legs keep moving...)
* (The power of this place shines within you.)

5 - Iciclus

"In the past, there was a legend"
"A legend, of HUMANITY and MONSTERKIND"
"MONSTERS, HUMANS, they developed a series of fierceful battles"
"The HUMANS, were victorious"

1. Tales Sunken in the Past

CREDITS:
Full song by: @dashingtoadie-the-sequel
-----

[* this is the once upon a time replacement of my au.]

* long ago, two races ruled over earth: humans and monsters.
* one day, war broke out between the two races.
* after a long battle, the humans were victorious.
* they sealed the monsters underground with a magic spell.
* many years later...

mt. ebott
201x

* legends say that those who climb the mountain never return.

001 - once upon a time.

This is a "role-swap" AU of UNDERTALE. It is partially meant as a homage to old AUs.

Notes:

- Fan songs/covers are perfectly fine.

- Some songs are outright "replacements" that play in the same context. Other songs take up the same soundtrack slot as an Undertale song but play in a different context. Mostly everything will stay in the same order as it is in the Undertale soundtrack, aside from some "extras". (Sorry for being so meticulous about this I'm autistic lmao)

- Everything (excluding otherwise credited songs) by @emi_head