A playlist inspired by underswap 2022. Considering that only a couple of tracks were created for this au, I decided to create a headcanon version for ost on it.

underswap 2.0 (underswap 2022?)

The control setting with extra tem (now in summer)
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Undertale was created by Toby Fox
In an alternate universe, 'Underswap' was created by Temmie Chang
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Leitmotif:
- Ball Chime/Mystery

☂ Ah... Picnic Day 🥧 ☂

Update: New thumbnail by @bence1114.

* that creep never stops showing up, does it?
* every time i check this place…
* that bot's always just standing there.
* makes me wonder what they’re up t-
* …
* oh…
* heh. that’s hilarious.
* next thing i know, a human falls down.
* you alright, kid?
* seems like you've had quite an event.
* name’s sans. sans the skeleton.
* i’m kind of a well-known figure at the flooded city.
* but i also take care of this old factory.
* by the way…
* i’m actually on a maintenance run right now…
* but it seems like your arrival’s an interesting case.
* why don’t you come with me?
* don’t worry, i got no *bone* to pick with you.
* i’ll gladly guide you over to my place.
* it’s got a cozy bed, some nice food...
* how’s that sound?
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Leitmotif(s):
- It's Raining Somewhere Else
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Sans takes the role of Toriel. He’s well-known among monsters in the Flooded City for his jokes and laid-back attitude. He also keeps watch over the city’s Old Factory (the Ruins replacement), because some monsters have been hanging around there in refuge from the rain and he wants to make sure everyone’s safe.

Speaking of areas, in this AU, areas swap in two ways: season-wise and aesthetics/style-wise. Here, the Ruins replacement (Old Factory/Flooded City) swaps seasons with Waterfall (Fall <> Spring), but swaps aesthetics with CORE (ruins <> factory).

Song by: @hyperflowey

Thumbnail by: @bence1114
swapshift logo by: @bence1114
Sans sprite by: @bence1114

UNDERTALE(tm) belongs to Toby Fox
Underswap belongs to the community
temmie's underswap belongs to @moonstrikefour/"Temmie Chang"
Swapshift belongs to Brenny114

Undertale © Toby Fox

swapshift - just an ordinary skeleton. (OST 4) (OUTDATED)

*(There's a festive winter wonderland all around me.)
*(Such...joy...it fills me with...determination.)
*(Interesting. Very interesting.)

Shipwrecked is a roleshift AU that makes role changes based on popular ships. These are not necessarily ships that we believe in, just ones that have some popularity within the fandom.
I'd classify the AU as taking itself half-seriously. It legitimately has its own style and ideas, but we might not do other stuff for it and it acknowledges how silly its own premise is.
The AU details a timeline after a botched reset by Asriel, in which he gets to be the protagonist, but no one remembers him. Not even his parents.
Along with the ship swaps, there are also some miscellaneous other changes just for the fun of it. For example, the Ruins are styled after Snowdin.

[Shipwrecked] Frosty Forest

This is a replacement to "Determination"
+-+-+-+-+-+-+-DIALOGUE+-+-+-+-+-+-+-
INTERESTING... 
LOOKS LIKE THE PROJECT DID AN, 
UNEXPECTED TURN...
I'M SORRY. 
I'M SO SORRY UNDYNE.
+-+-+-+-+-+-+-AU INFORMATION+-+-+-+-+-+-+-
Natureled is a brand new roleshift AU, centering around So Sorry and his very own comic! In this story, he’s the one having an adventure. It’s about time he gets the spotlight!

Gaster takes the role of Asgore. He is the leader of the Project. As much he tries to break the barrier with science, that much of life is disappearing from the underground. Not that life is going away, some monsters disappeared during the Project. He is now owning the throne, and the whole underground. No one can run away from this Project. No one.
+-+-+-+-+-+-+-LEITMOTIFS+-+-+-+-+-+-+-
- Darkness Falls

Music by @bence2224 & @moonstrikefour
Thumbnail (or rather, Logo) by @bence2224

Ores of Curiosity is a collaborative account run by:
@moonstrikefour
@bence2224
@hyperflowey

Natureled was created by Slick Silver [@slick_silver], owned by Why_Bence [@bence2224]

[Undertale AU - Natureled] A Most Sorry End Indeed

If you have any Moonstriker tracks that you would like to see on Soundcloud, DM me the link (either through Soundcloud messages or Discord [Bowser Man#9144])
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=--=-
This replaces "Anticipation" and "Enemy Approaching".
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=--=-
You can use this track for your stuff, provided you give credit to me, the composer of the song, and link back to its original source. Please ask beforehand.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=--=-
UNDERSWAP (2022) is simply a modern version of well... Underswap. This is by no means related to my personal interpretation of Underswap and will not plan to release the full soundtrack, but will release the tracks occasionally (mostly for the unique role choices) like "DELTASWAP". In this case mainly, Napstablook swaps with the Ruins Dummy and Mettaton swaps with Mad Dummy/Mew Mew! And yes, you can use this for your underswap take that has the same roles like I mentioned above, as long as you credit me for the themes.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=--=-
Motifs:
- Ghost Fight
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=--=-
Original release date: January 2, 2022
Title and description taken from Youtube upload (https://www.youtube.com/watch?v=bob3SZQrRZM)
Song by Moonster (@moonstrikefour)

[New Year Special] [Undertale AU - UNDERSWAP (2022)] Tutorial + Odd Opponents

If you have any Moonstriker tracks that you would like to see on Soundcloud, DM me the link (either through Soundcloud messages or Discord [Bowser Man#9144])
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=--=-
This replaces "Your Best Friend" and only plays in battle.

████
████
████ ████ ████ ████ ████
█████████ ████
████ ████ ████ ████ ████████ █████
████ ████ ████ ████
████ ████ ████ ████
██████
██████
Join us.
Join us.
Let us shape this world of our/my own free will.
Promise.
Promise.
You won't fall within the abyss in my side.
The absolute is lying in wait for humanity's crack of doom.
Lorem ipsum docet.
Come join the fun.

♡ Join the fun
     Do not join the fun

All hell broke loose
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=--=-
You can use this track for your stuff, provided you give credit to me, the composer of the song, and link back to its original source. Please ask beforehand.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=--=-
UNDERSWAP (2022) is simply a modern version of well... Underswap. This is by no means related to my personal interpretation of Underswap and will not plan to release the full soundtrack, but will release the tracks occasionally (mostly for the unique role choices) like "DELTASWAP". In this case mainly, Memoryhead, the unknown amalgamate, swaps with Flowey the flower!
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=--=-
Motifs:
- Original
- The Fallen Child
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=--=-
Original release date: January 7, 2022
Title and description taken from Youtube upload (https://youtube.com/watch?v=D8zwWYcc03c)
Song by Moonster (@moonstrikefour)

[Undertale AU - UNDERSWAP (2022)] Fun

Undertale by Toby Fox
Swapped Rhythms by FwugRadiation

FwugRadiation - SWAPPED RHYTHMS Soundtrack - 06 Hey! Happy Harvesting Season~♪

* alright.
* you’ve proven you can solve puzzles…
* …that have the slightest of danger.
* kudos to you, kiddo.
* but what if there was incoming danger?
* what if you needed to act fast in a dangerous situation?
* ‘cause, you see, this bridge…
* has been falling apart recently due to the excess water.
* pretty soon it may start collapsing.
* depending on how circumstances go…
* i’d say it may even collapse now.
* so, kid…
* run as fast as you can.
* i’ll see what i can do to fix the bridge.
* good luck.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Leitmotif(s):
- Premonition
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
The long hallway in the Ruins swaps with the long laser bridge from the CORE. Here, it’s an old and rickety suspension bridge, and there’s a lot of water just below it. Can Chara make it to the other side before the bridge collapses?

Song by: @bence1114

Thumbnail by: @bence1114
swapshift logo by: @bence1114
UNDERTALE(tm) belongs to Toby Fox
Underswap belongs to the community
Temmie's underswap belongs to @moonstrikefour/“Temmie Chang”
Swapshift belongs to Brenny114
Undertale © Toby Fox

swapshift - Flooding Bridge (OST 8)

[EDIT NO. 1 : Fixed a mistype in the dialogue. Special thanks to @cinn-waffle for pointing it out.]

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
* DUMMY - ATK 10 DEF 0
* Probably not the same dummy from earlier.
* But you didn't want to hurt them.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Subswitch is a new UNDERTALE AU. Heavily inspired by Underswap takes, but this AU isn't clearly that. Face against a whole new universe, with interesting characters/monsters! Choose your future to shine in the light, or get lost in the dark. The choice of monsters, are in your hand.

Undertale is by Toby Fox.
Underswap is by the fandom of Undertale.
Subswitch is by @bence1114 aka Why_Bence.
Discord server: discord.gg/PGSYqYf3XB
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The Dummy swaps with Napstablook. They are living their life in the Crimson Valley. Found a perfect place to stay for a day, until an intruder came by and hurt them. Not a great day anymore.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Leitmotifs (By order):
- Enemy Approaching (Part 1) (Modified)
- Anticipation (Modified)
- Enemy Approaching (Part 2 + Part 3)
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

SUBSWITCH Soundtrack 010 - Dummy

A:* Q-quick! Hide behind this...erm..statue! 

Frisk hides behind the statue 

A:* O-oh... H-Hey, Undyne...
U:* Alphys!! Have you seen a human around here?!
A:* W-What?! 
A:* N-N-No o-of course not a-absoluetly not-
A:* ᵂʰʸ ᵈᵒ ʸᵒᵘ ᵃˢᵏˀ
U:* DRAT!!
U:* I thought for sure one would come today!!
A:* ...M-Maybe the humans decided to stop coming here??
A:* I mean, I would imagine they notice people going missing...
U:* True...
U:* But it's been so boring in the guard lately!!!
U:* All we do is patrol around and occasionally stop a troublemaker!
U:* Where's the excitement?! Where's the action?!
U:* WHERE'S THE OVER THE TOP FIGHTS LIKE IN THE ANIMES?!?!?!
A:*W-Well I.. 

Undyne looks over at the statue before looking back at Alphys 

U:* Hey Alphys, was that statue here before?
A:* I think Jerry put that there a while back
A:* W-We probably shouldn't mess with i-
U:*I don't like it.
A:* What?
U:* It just looks messy, smuglike and...wrong.
U:* Its a complete mockery to all statues!!
A:* W-Well still, w-we probably shouldn't-
U:* Nrrrgh, thats it!! I'm getting rid of it!! 

A:* U-Undyne! W-wai-!! 

Undyne jumps over to the statue and tosses it aside, causing the statue to explode and reveal the human 

U:* What the...
A:* Oh no...
U:* A HUMAN?! 

U:* Fuhuhuhu...
U:* I knew that this day would come! And here you are!!
U:* The seventh soul...
U:* After all these years of being trapped down here...
U:* After all the pain we've endured...
U:* I'll rip out your soul and bring it to our king...
U:* And then they will free us...
U:* . . .
U:* SCREW IT!
U:* WHY I AM GIVING OUT MY EPIC MONOLOGUE WHEN I CAN JUST KILL YOU?!
U:* NGAAAAAAAAAA- 

Undyne's phone begins to ring 

U:* What the...
U:* WHO IS IT?!
* . . .
U:* NO!! I AM BUSY WITH-
* . . .
U:* BUT IT'S A HU-
* . . .
U:*I... I understand...
*. . .
U:* Well...
U:* You got lucky this time!
U:* But when we meet again...
U:* I WILL STRIKE YOU DOWN!
______________________________________ 

Background Art by Funside
Music by Franciuscu 
Dialogue by Johnny_Moon
Au by Funside
_______________________________________ 

Crashing in the Papyrus role, Undyne is currently a rookie for the royal guard. Even with that title, Undyne is no pushover when it comes to her strength and passion to fight to protect and save monsterkind from their underground prison, going as far as to cosplay like an favorite anime hero the best she could along with her own flair in the mix (With the pirate flag cape being added along with Alphys coming up with the design). She can be a bit...much at times but her heart is in the right place.

[Plotwist] 016- Hey Punk!!

Toby Fox - UNDERTALE Soundtrack - 07 Anticipation

Eh...it's decent I guess. I've toyed with this song so many times in my spare time I finally decided to try and do something with it. And the result. It's...okay? But I digress. Snowy with Waterfall's Leitmotif, ladies and gentlemen.

Oh yeah, and if you've never heard of this AU before, and just stumbled across it in the endless void that is Soundcloud, you can check it out at http://ut-taletwist.tumblr.com/

[Undertale - Taletwist AU] Snowy

"*name's. toriel the... uh...
"*... heheh, that's not important.
"*you're a human, right?
"*that's HILARIOUS."

Download link: https://fanburst.com/robin-blend/altertale-names-toriel-fallen-downsans-remix-2

NOTE: Do not start arguments here. If you don't like the AU, then say it somewhere else other than here, and just enjoy the music.

AlterTale is an Undertale AU 8y Friisans. You can learn more here: http://friisans.tumblr.com/atmasterpost

"Fallen Down" & "sans." 8elong to Mr. Toby Fox.

ALTERTALE - name's toriel. (Fallen Down/sans. Remix)

My friend named it "Boneache", this sans from StorySwap/Altertale the original au is StoryShift this is StorySwap so this is StorySwap/Altertale sans's theme enjoy....ok i am confused 😕 

Boneache - Altertale/StorySwap Sans Theme by Hakuregin

This track was contributed by @blaring-bombomb

--
Discord Server:
discord.gg/Dnk9uQh

Tumblr:
https://undertale-underswap-official.tumblr.com/

Gamejolt:
https://gamejolt.com/games/undertale-underswap/361030

New Home

This track was contributed by @rubytheruby

--
Discord Server:
discord.gg/Dnk9uQh

Tumblr:
https://undertale-underswap-official.tumblr.com/

Gamejolt:
https://gamejolt.com/games/undertale-underswap/361030

New Home (Music Box)

Sensetale is made by: https://soundcloud.com/that-jester-dude
Check the official Sensetale tumblr here: https://nonsensical-questions.tumblr.com/
Join the Discord Server: discord.gg/u7WC9CJ
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Also I recommend you to read the comic from the beginning if you haven't! It's really fun to read at.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Leitmotives (in-order):
▪Spider Dance
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-

[sensetale. (OST) - Muffet] Along Came a Spider

*Let me tell you a story about a boy who wanted to feel the sunshine.
*But first, I will tell you a history nobody has ever told to anyone before.
*Once upon a time, two races coexisted on EARTH to preserve peace and harmony: HUMANS and MONSTERS
*But... unfortunately, that did not last long.
*The HUMANS wanted power, both races waged war against each other.
*Ultimately, the HUMANS won the war, consequently sealing the MONSTERS from the face of EARTH using a magic spell, the BARRIER.
*Which no one can cross over to the surface.
*And everyone is prohibited to mountaineer MT. Ebott... or else, no hope to return.

*MT. Ebott 201X... (camera pans from the mountain to the castle in the underground)
*The Underground, 201X

*Ah, this is where I am going to tell you that story.
*The boy wondered if someday... he could be free from the eternal imprisonment.
*Therefore, he always came to the Ruins to gaze the light above.

UNDERTALE

AU Slot: Underswap: Alternative, Undertale: BETA, Any with Chara swapped with Asriel

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
This can be for any au want (Chara as Asriel only), provided you give credit to original creator of the song. Please ask beforehand.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Go listen to the other Chara!Asriel related tracks here:
Track 71 (Undertale): https://soundcloud.com/moonstriker/a-chara-asriel-swap-track-71-undertale-tale-of-the-fallen-child
Memory: https://soundcloud.com/moonstriker/a-chara-memory-tribute
His Theme (OST): https://soundcloud.com/moonstriker/a-chara-his-theme-melody-within-the-vessel-ost-version
His Theme(In-game): https://soundcloud.com/moonstriker/a-chara-his-theme-melody-within-the-vessel
Hopes and Dreams: https://soundcloud.com/moonstriker/early-300-followersa-chara-hopes-and-dreams-hopes-and-dreams
SAVE the World: https://soundcloud.com/moonstriker/300-followers-halloween-23a-chara-save-the-world-last-game-save-the-world
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
I gotta do the OUaT before getting to YBN replacement for them =P Anyways, enjoy!
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Leitmotives (In-order):
-His Theme
-Original
-Your Best Friend

[A Chara and Asriel Swap - Once Upon a Time] Down Memory Lane

AU Slot: Underswap: Alternative, Undertale: BETA, Any with Chara swapped with Asriel

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
This can be for any au want (Chara as Asriel only), provided you give credit to original creator of the song. Please ask beforehand.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Go listen to the other Chara!Asriel related tracks here:
Track 71 (Undertale): https://soundcloud.com/moonstriker/a-chara-asriel-swap-track-71-undertale-tale-of-the-fallen-child
Memory: https://soundcloud.com/moonstriker/a-chara-memory-tribute
His Theme (OST): https://soundcloud.com/moonstriker/a-chara-his-theme-melody-within-the-vessel-ost-version
His Theme(In-game): https://soundcloud.com/moonstriker/a-chara-his-theme-melody-within-the-vessel
Hopes and Dreams: https://soundcloud.com/moonstriker/early-300-followersa-chara-hopes-and-dreams-hopes-and-dreams
SAVE the World: https://soundcloud.com/moonstriker/300-followers-halloween-23a-chara-save-the-world-last-game-save-the-world
Once Upon a Time: https://soundcloud.com/moonstriker/a-chara-and-asriel-swap-once-upon-a-time-down-memory-lane?in=moonstriker/sets/undertale-au-chara-and-asriel
Your Best Nightmare: https://soundcloud.com/moonstriker/a-chara-and-asriel-swap-your-best-nightmare-special-hell
Finale: https://soundcloud.com/moonstriker/a-chara-and-asriel-swap-finale-the-last-straw
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Did I forget about Start Menu? Nah =P
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Leitmotives (In-order):
-His Theme

Source of Image: https://vheef25.tumblr.com/post/131617352422/someone-has-to-take-care-of-these-flowers

[A Chara And Asriel Swap - Start Menu] A New Story (Full)

Underswap was created by Temmie Chang

This replaces "Mysterious Place"

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Leitmotif:
-Dweller's Empty Path(by Temmie Chang) - Underground Path (Modified)

underswap 2.0 (underswap 2022?)

Pale_guy