Here are some Au themes I found when exploring the SoundCloud website. Enjoy.                                   
Rules for this Au Playlist:                                              
1. If there's a new version of the theme that sounds better, that theme will be replaced with the new version.                                                                     
2. If a Au theme haves a motif that similar to that theme, it won't be added to this playlist.                   
3. If an Au theme sounds so bad that it should get a V2, it's added to the bottom Best to Worst themes

Update: I Updated picture because that other one was outdated.

An Once Upon A Time Undertale AU Compilation 2025

The monsters were in a difficult situation, but they held onto their hopes and dreams.
That is until one final human came along...
And they all disappeared without a trace.

Aftergore is a series of AUs taking place after Undertale's neutral endings, in which a new human enters in Frisk's wake.
Aftergore VI, the King Papyrus ending, details an ending in which everyone who could be killed by Frisk was killed with the exception of Papyrus. He's the ruler of the underground by default now, and he does his best to keep morale up in an underground more hopeless than ever before. Humans are to be treated as targets of puzzles, no matter their moral alignment. At least that's Papyrus's goal. His subjects might not be so keen on that.

Learn more about Aftergore and other projects here! discord.gg/qmtQxwYKfD

Aftergore logo by @repeatsc and Toadie

[Aftergore VI] Where We Left Off

Yeah, I'm doing this.
Undertale Rearranged is a fun passion project where I attempt to rearrange all 101 tracks of Undertale.

UNDERTALE by Toby Fox.

001 Once Upon A Time - Undertale Rearranged

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

001 - Once Upon A Time

001. Sweet Dreams

MT. EBOTT
201X

Legends say that those who climb the mountain never return.
------
Intro Sequence Theme
Track: GoldenFlowers 
Image: GoldenFlowers 



[sans updated status.]
* zzzzzzzzzzzzzzzzzzzzz

The game originally forcibly closed itself at the DELTARUNE-like cutscene. After we restarted our computer, ironically, the game booted immediately into a garbled version of the Once Upon a Time sequence.
------------------------------------------------
@caramel-cupcakes
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Once Upon A Time (2014)

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…

As the years went by, humans fell down the mountain.
Most of them never returned.
However, the last fallen human not only survived...
But broke the barrier, after a fierce battle.
Due to the acts of a selfless and caring human...
Monsterkind was able to see the sun once more.
And peace between the two races was restored.
However, peace can only last so long…
--------------------------------------------
Song by @therosaic

Twice Upon A Time

* This time.
* We shall unearth an old story once more...
* Rise.

001 - Once Again

Once upon a time, there were two ruling Earth.
HUMANS and MONSTERS.
There was once harmony; The union of contrary
Yet it has been diminished.

The MONSTERS fell one by one, overpowered by the HUMANS.
A meager amount of MONSTERS then remained.
They were sealed under the MOUNTAIN and left to bask in eternal sorrow.
From neighbors, to families and friends;
All had been eviscerated and scattered into dust.

Left in silence, the MONSTERS lie in wait.
Time befalls the régisseur.
Its cue has arrived.

Long Ago

MT. EBBOT 201X
Those who’ve entered the mountain are destined to never return.

＊┈┈┈┈＊┈┈┈┈＊┈┈┈┈＊┈┈┈┈＊

Track composed by :
SynthMint’s 

Discord server:
https://discord.gg/Kb8cMTZCGY

01. Many, Many Moons Ago

I forgot to upload this months ago because I'm a butt. The theme for the IF intro, which can be viewed here: https://www.youtube.com/watch?v=o-Ky4EtoNbM

Read the comic here: http://invertedfate.tumblr.com/masterpost

[Inverted Fate AU] Back to Zero V2

Omg!?!??! UT: RO is back?!?!?!?!
Yes, everybody!! This is back!! And now with better stuff.

I hope you guys enjoy this. I'll make sure not to close this xdxd

Anyway, here's the new server, if you want to join:
https://discord.gg/YhnFa7Q

By the way, this track was made by @igretz-4426

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.

Check out the original Soundtrack:
https://tobyfox.bandcamp.com/album/undertale-soundtrack

001 | Beginning Anew

Song made by: https://soundcloud.com/siegfried-e-s-o

Join our Discord! - discord.gg/JyUy8tq

001 - Once Upon A Time (Siegfried)

Aftergore is a series of AUs taking place after Undertale's neutral endings, in which a new human enters in Frisk's wake.

This Once Upon A Time is shared by the first four variations.

Learn more about Aftergore and other projects here! discord.gg/qmtQxwYKfD

Aftergore Discord: https://discord.gg/WbzykND

[Aftergore] Where We Left Off

A guest submission by @sexy-synth-man! Please follow him, he's great and deserves way more attention.

Aftergore is a series of AUs taking place after Undertale's neutral endings, in which a new human enters in Frisk's wake.
Aftergore V, the King Mettaton ending, details an ending in which Asgore, Toriel, and Undyne are all slain, leaving Mettaton next in line for the throne. He's turned the Underground into an aesthetic corporate dystopian paradise. Humans are to be invited to join his Fan Club. And if they reject it, they die.

Learn more about Aftergore and other projects here! discord.gg/qmtQxwYKfD

Aftergore logo by @repeatsc and Toadie

(Guest Track - Ethosein) [Aftergore V] Where We Left Off

Aftergore is a series of AUs taking place after Undertale's neutral endings, in which a new human enters in Frisk's wake.
Aftergore CDIV, the Impossible/Dirty Hacker ending, details an ending in which a curious player messes with code to make a certain boss both dead and alive at the same time. The results are...illogical. Humans are to be treated as threats to the timeline above all else, and that is a crime punishable by death.
If you're curious on the AU name, all the Aftergores are numbered with Roman numerals. "CDIV" translates to "404."

Learn more about Aftergore and other projects here! discord.gg/qmtQxwYKfD

Aftergore logo by @repeatsc and Toadie

[Aftergore CDIV] Where [?̷̴̨͢?̵̢͜͝?̧͟͝͠͞] Left Off

UNDERTALE Soundtrack

Undertale by Toby Fox
Swapped Rhythms by FwugRadiation

*In times of yore, two unique kinds were risen to care for the EARTH: HUMANS and MONSTERS.
*In the aftermath... it became the worst nightmare for both of them.

FwugRadiation - SWAPPED RHYTHMS Soundtrack - 01 In Times Gone by...

This is just my second account for KennyVargas20 just in case for some reason. lol

An Once Upon A Time Undertale AU Compilation 2025

Kennytheknight