GameChanger, a roleshift that I would consider to be one of the classics. Never got enough love beyond "oh Sans and Muffet swap" imo, so here's something for Asgore, who took the role of Mettaton. We don't know if GC is ever coming back, a scrapped unreleased track was released by its creator very recently but prospects are looking bleak for the AU itself.
This project does involve us doing a lot of guesswork, so this is our theory for how the "musical" segment would go with Asgore in GC, with Asgore giving a heartfelt monologue about how the Underground got to be the way it is.

Song by: @moonstrikefour
AU and logo by: @punniester-master_2019
Dormant/defunct OST account: @gamechanger_au

"Asgore seriously needs some true love"
-Moon

----

Operation F.I.G. (short for Filling In the Gaps) is a project run by @slick_silver that aims to show some love to AUs that have either died or have been dormant for a long stretch of time by making music that never got to be made for said projects before. Many of these will in one way or another be speculative, and all tracks on this page are non-canon / unofficial unless the AU creator decides otherwise. If you are the creator of the AU and would like this track taken down for any reason, let us know and we will comply. Our main rule is that we can't do tracks for old projects run by members on the team, so this is all out of appreciation for others. If you're a musician (or artist) who would like to apply to be a part of our team, shoot Slick a message on Discord at Slick Silver#8818 .
Have a wonderful day!

[GameChanger] The Story of Our People

Sisyphus

*Please do not upload this song to YouTube and/or any of my other songs or claim it as your own. All unpermitted uploads will be reported and deleted.*

* Hey... Uh...
* (Alphys pull it together you need to make a good first impression!)
* Human! Don't worry.
* Y-you're in good hands now.
* It's my sworn duty to look for humans.. 
* (Okay it actually isn't I just look her for junk but saying it like that is cooler)
* And to guide them to the temple's exit.
* So!! Let me do that, and I will let no harm befall you.
* (Oh my god I actually said it correctly)

Mortatoriel 1, the Flawed Pacifist ending, details an outcome in which a fallen human spared and befriended every monster except for Queen Toriel. Former king of monsters, Asgore, has finally returned to the throne after his long exile. Hoping to atone for his mistakes and abandon his declaration of war, King Asgore has instated a new policy detailing that humans are to be treated fairly, with kindness and friendship.

Alphys takes the role of Napstablook... much like in Aftergore I. Funny, huh? There's a story-related reason behind this, though. Alphys was sent by Asgore to the Sunken Temple to keep patrol of any humans who fall down, on the King's orders that she guide them through the Underground and keep them safe. Seeing as the last fallen human showed kindness to others, she doesn't see this as too difficult or unreasonable of a job. But don't underestimate her heroic spirit - if you try to rush forward too recklessly, she may decide to take matters into her own hands. Especially, if someone were to try to hurt a fallen human...

Note (07/04/21): Track thumbnail has been updated again by @the_freaking_weirdo.

Track by: @bence1114 (with help from @hyperflowey)

Dialogue by: Yertendo (added 10/02/21)

Track thumbnail by: @bence1114 (updated by @the_freaking_weirdo)
Mortatoriel logo by: @moonstrikefour
Alphys sprite by: @bence1114

Mortatoriel Discord server if you're interested: https://discord.gg/mj94MN4JHW

Mortatoriel AU belongs to: @hyperflowey
Aftergore AU belongs to: @slick_silver
Underswap AU belongs to Hatsune Miku/the Undertale AU community ig

Undertale © Toby Fox

[Mortatoriel 1] Geeky Guardian

* I guess we're being haunted.

Thumbnail by @x51rA. Link to the AU's Tumblr - https://fracturedtale-au.tumblr.com/. Link to AU's discord - discord.gg/SWazfaG

[Fractured Tale] Scrapyard Skirmish

New thumbnail by @bence1114.

Dialogue TBD.

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Leitmotif(s):
- Spooktune (based on @moonstrikefour's "The Emotional Piece": https://soundcloud.com/more-underswap/temmieswap-66)
- Ghouliday (based on @moonstrikefour's "Ghost in the Machine": https://soundcloud.com/more-underswap/temmieswap-54)
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Yes, that's right. Ores of Curiosity the Musical is a thing now. And yes, this is Once!Chara. ;)

More AU description TBD.

Song by: @hyperflowey

Thumbnail/ 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 - An Emotional Story (OST 1)

*...
*...hi.
*What, you didn't forget about me, did you?
*Some friend you are.

Gorgeous thumbnail by @mildred-f ( https://twitter.com/ManeaterMild ), featuring the logo by Dusty and @tripped-as-fawk-boi

It's rather late, but here it is. The 100 follower special. Toadie and I would like to thank everyone who took the time to listen to this weird little Megalovania-free account. Despite all of Toadie's work being fantastic, part of me expected this account to remain at 40 followers forever, especially since it's pretty much exclusively dedicated to my little AUs that no one cares about. I'd like to particularly thank @megaflamehedge , an idol of both Toadie and myself, for giving us follow. That was certainly something I never would have expected, but we both greatly appreciate it!
More content to come in the future. Here's to 100 more! (...which at that point would put us closer to 240 than 200.)
One last time, thank you. Everyone.
-Slick

For more info on Schreibertale and many other Slick Silver AUs, check out the server: https://discord.gg/qmtQxwYKfD

(100 follower special!) [Schreibertale] A Brighter Tomorrow

So, I had this is my mind for a while, and then I decided to make this.
However, I have no idea who's Asgore in Taletwelve, so let me know if you know who's Asgore in it.

Credits :
@michael-musician-12 for recreating most of the motifs, fixing the chord progression and figuring out how to fix the stpwyfs reverse cymbal.
@mr-too-many-aus for Taletwelve and Howdy Stranger

Say Hi! [A Howdy Stranger Megalolazing]

Community is a great show and you all should watch it.
It's one of my favorite shows ever, and once Toadie finally saw it, it became one of theirs too. So naturally just like everything in my life I found something I liked and turned it into an Undertale AU. Updates will be infrequent but they'll happen-- Toadie and I would love to make this into a thing.
It also has a real banger of a theme song.

Toadie and I collabed on the logo! I think it came out quite nicely. Simplistic, but good!

Side note: Toadie fucking INSISTS that I should have called this Greentale. The only compromise we could reach is that I had to admit that in the description.

For more information on this AU and many other Slick Silver projects: https://discord.gg/qmtQxwYKfD

[Community Theater] Fundamentals of Expository Storytelling

*Please do not upload this song to YouTube and/or any of my other songs or claim it as your own. All unpermitted uploads will be reported and deleted.*

Howdy, everyone! I wasn't lying when I said I would be coming back from my long hiatus. Aftergore is a pretty big AU currently, so I thought I'd contribute some love and support for the AU. This is my 10th song cover, as well as my first ever "Toriel" track (specifically, a track that revolves around Toriel herself, not a Toriel-styled track like "His Hopes"), disregarding an unreleased "Fallen Down (Reprise)" cover. Enjoy!

A quote from Slick Sliver:
"Aftergore is a series of AUs taking place after Undertale's neutral endings, in which a new human enters in Frisk's wake.
Aftergore I, the Incomplete/Flawed Pacifist ending, details an ending in which everyone (except for Asgore) was spared and befriended. Toriel has taken her ex-husband's place, ruling the Underground with both strictness and kindness. Humans are to be treated not as enemies, but as friends.

Toriel takes the role of Asgore. However, she does not hide away in the castle for the whole adventure. You can find her at her very own school in Snowdin Town, where she's happy to see you! Surprised? Remember, her policy is to treat fallen humans not as enemies, but as friends!
She wouldn't ever do anything to hurt you...right?"

Original track by: https://soundcloud.com/dashingtoadie-the-sequel (uploaded on https://soundcloud.com/toadiedoesalltheworktbh)
URL idea by: @moonstrikefour

Aftergore logo (edited on Fotor) by: @repeatsc (with help from Slick and DashingToadie)
Aftergore Discord: discord.gg/WbzykND
Aftergore AU belongs to: https://soundcloud.com/slick_silver

Undertale © Toby Fox

[Aftergore I] Boss Monster (10th Song Cover Special)

Hydromix is a roleshift AU primarily utilizing characters that appear in Waterfall. Undyne takes the role of Sans. Don't expect too much to come out for this, it's kinda just for fun.

EDIT: Nevermind to this next part someone beat us by like 2 weeks lmfao https://soundcloud.com/mal-kai/shes-fighting-for-the-world
EDIT 2: Alright nevermind one got made on YT a few years back I'm just blind lmao

This fandom has existed for over half a decade, and not one Undyne IRSE has ever existed. For Christ's sake, Monster Kid and Temmie have gotten IRSEs, but never Undyne!? I realized this a few years ago, and throughout that entire time not one was made. Well now we're putting an end to that. Behold, the first (at least to our knowledge) ever Undyne IRSE.

Logo by @darwinmusik

[Hydromix] Downpour

*Please do not upload this song to YouTube and/or any of my other songs or claim it as your own. All unpermitted uploads will be reported and deleted.*

At long last, after hours of work, here's a new "Reality's Reflection" track, specifically the menu theme. This has a lot more variations than Undertale's "Menu" track, and a lot more progressive changes.

This is an equivalent to Dorked's "Restart" (menu theme) for Inverted Fate: https://soundcloud.com/megaflamehedge/start2floweyboogaloo

Note: Bonus points and a special prize if you can correctly guess the track's stylistic inspiration.
Note (05/29/21): @rainyisverycool got the answer correctly on what subtly inspired this track's chord progression, so he gets the bonus points and a surprise coming up eventually!
Here is the order in which motifs order:
(Variant 0/Start)
- "Temmie's Room" from Empty Chasm (inspired by Kibo's "Ambitions")

(Variant 1/Meeting Temmie)
- Just a simple bassline

(Variant 2/Befriending Mettacrit)
- Uwa!! So Temperate
- Extended drumline

(Variant 3/Sparing Toriel)
- "Hot Demon Man" from Escaped Chasm, modified (based on MoonStriker's "Ragel": https://www.youtube.com/watch?v=xkep4o1l2mQ&list=PLB71Dd48fmYubhNlKgdXlZlq3ChGtencA&index=5)

(Variant 4/Befriending Sans)
- Additional piano
- Clav instruments for old Sans-y

(Variant 5/Sparing and Befriending Papyrus)
- Nyeh Heh Heh!/Bonetrousle (background "bassline" chords)
- Enhanced drumline (again)

(Variant 6/Meeting Dappertune)
- Ghost Fight (intro)
- Background strings

(Variation 7/Sparing and Befriending Undyne)
- Once Upon a Time (Part 1)
- Don't Forget

(Variation 8/Meeting Alphys)
- Alphys (Part 1), just barely audible
- Enhanced drumline (yet again)

(Variation 9/Revelation of [???])
- Reunited

(Variation 10/Sparing Asgore + Full)
- "Together" by Robin Blend (Monster Kid's theme)
- "Friendship" by Toby Fox
- sans./STMPWYFS

Thumbnail made by: @asriel_stuff

Reality's Reflection Discord server: https://discord.gg/Qd3T5C8k

Reality's Reflection belongs to me
Mirrored Inversion belongs to Doctorine and Kalin
Inverted Fate belongs to Dorked: @megaflamehedge
Undertale, Deltarune © Toby Fox
Escaped Chasm © Temmie Chang

[Reality's Reflection] The Journey Thus Far (+Variations)

Howdy! I'm HyperFlowey. I'm an UT/DR fan who has neat AU ideas under his belt; although I do have other, non-Toby Fox stuff to present as well.

New profile picture (as of 05/27/23) by MoonStriker/@moon5triker: https://twitter.com/MoonStriker1/status/1413034816866447363/photo/1
New background image (as of 05/27/23) by DONJOX_14: https://www.reddit.com/r/Undertale/comments/qxcbja/mtebott_pixel_art/

Checking the Q&A/FAQ/whatever may be recommended just in case.

Favorite SC artists:
https://soundcloud.com/moon5triker
https://soundcloud.com/junnboi-the-fourth
https://soundcloud.com/kibo-vgm
https://soundcloud.com/megaflamehedge
https://soundcloud.com/a-few-screws-loose
https://soundcloud.com/dashingtoadie-the-sequel

Honorable mentions:
https://soundcloud.com/smartcellist1
https://soundcloud.com/lucaspucasmusic
https://soundcloud.com/robinblend
https://soundcloud.com/z-nogyrop-the-second
https://soundcloud.com/starfury2
https://soundcloud.com/sasterdadudester
https://soundcloud.com/green-griefer
https://soundcloud.com/sogooditburns
https://soundcloud.com/atriofficial
https://soundcloud.com/alaysisundertale

Friends/followers:
https://soundcloud.com/schmoxy_the_snob
https://soundcloud.com/monika-the-rebbit-dearrebbit
https://soundcloud.com/user-736657354

https://soundcloud.com/moon5triker
https://soundcloud.com/smartcellist1
https://soundcloud.com/user-458203278
https://soundcloud.com/offbrandbiscuit
https://soundcloud.com/plumber-man-848937710
https://soundcloud.com/a-profile-url
https://soundcloud.com/creeptank030
https://soundcloud.com/bence2224
https://soundcloud.com/epik-bruh
https://soundcloud.com/thepiano-freak
https://soundcloud.com/ravenjess27


Q&A:

Q: What AU projects do you own?

A: My AUs are as follows:
- "Leaptale: Dream Epic" (Leap!/Ballerina x Undertale AU with some original gameplay ideas) (currently on hiatus)
- "Reality's Reflection" (my take of Mirrored Inversion that attempts to be more like TS!Underswap in terms of expanding on characters' roles and how their actions shape the world around them) (in progress)
Check it out here: https://docs.google.com/document/d/1k11bsNynS98FuGEzP1m3WNCdV4eFluR7DKnookRlFJY/edit?usp=sharing

Q: Do you take song requests?

A: It's perfectly fine to request songs, and I'm happy to do them as long as I have the time and effort to spare.

Q: Will there be any special music events?

A: Expect the usual [insert 100+] follower specials and maybe birthday specials, but there may also be an Ebott Roulette once in a while. It helps to have a variety of tracks so I don't get tired out, y'know?

Q: Are we allowed to re-upload and/or extend any tracks?

A: I'm on the fence about unpermitted re-uploads or extensions, though when I have the resources on YouTube I may extend my own tracks someday. If you're very honest about the re-uploads and ask through DMs, then I may allow you to download it, but otherwise please try to hold off on it. Cool? Cool.

Q: What about comments related to AU projects? More specifically, can we post joke comments on your tracks?

A: If the track in question's nothing serious, then I don't mind joke comments, but please make sure to respect the official AU material, whether it would be mine or someone else's. I kindly ask that we don't put personality swap comments in tracks for my AUs because it would undermine the point of the characters and story of the AU in question.

Q: What's your music making software?

A: My current software for making tracks is Garageband 6.0.5, though I may get a new software someday to allow for a more conventional style.

-

I hope you enjoy my tracks, and stay tuned for more!