Swapped Rhythms was created and owned by: https://soundcloud.com/punniester-master_2019
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Swapped Rhythms is an Undertale AU which essentially, character motif swaps with their other respective motif, for instance: "Fallen Down" with "Heartache", "Determination" with "Bergentrückung", etc...
The creator has also designated that the character designs and attributes are remodeled: Sans wearing a black tank top and ostensibly trousers, his flashing eye presented in his right orbit instead of his left, and a special feature on his left hand waving a blue glint. The aforementioned aspects are revealed earlier on here: https://soundcloud.com/punniest-master_2017/swapped-rhythms-megalovania
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The tracks composed may or may not be official though.

Youtube version: https://www.youtube.com/watch?v=yRcbsS_rdgQ&list=PLB71Dd48fmYs3-DEQirQnQxnRo6kX1SsE

Undertale/Deltarune AU - Swapped Rhythms (Moon's Musical Rendition)

swapped rhythms

Swapped Rhythms is created by @punniester-master_2019
Check em out! They make really great music, along with every other musician in this playlist! ^^

Alt Playlists:
https://soundcloud.com/a-profile-url/sets/undertale-deltarune-swapped-rhythms
https://soundcloud.com/a-profile-url/sets/undertale-swapped-rhythms
https://soundcloud.com/a-profile-url/sets/deltarune-swapped-rhythms

Undertale/Deltarune Swapped Rhythms (+Other Tracks with Swapped Motifs and etc.)

SZTOSY

Flowriel

I don't know, I thought this would be a good idea.

Last Goodbye In The Style Of Once Upon a Time

{Swapped Rhythms} Fallen Down

All credits and rights go to Aaron Fraser-Nash. Go check out his other ST parodies on YouTube!!

Eleven Sings a Song (Stranger Things Parody)

Dustin Sings A Song (Stranger Things Parody) Aaron Fraser Nash

Us - Call Me Maybe Parody - Wassabi Productions

Rap Do Lord Commander -( Final Space ) - AN

Rap Do Tribore - ( Final Space ) - AN

This replaces "Once Upon a Time"

Swapped Rhythms was created by: https://soundcloud.com/punniester-master_2019
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All the leitmotives are from "Your Best Nightmare" if you still can't tell. The 2nd part is from the unused part of it and heavily modified, though the rest is mildly modified as well. Again, it's a fan-track if not official.
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Check out the entire playlist of Moon's musical rendition of Swapped Rhythms here: https://soundcloud.com/thesecondstrike/sets/undertale-au-swapped-rhythms

Source of Image: https://sasuisgay.tumblr.com/post/142091733012/velocesmells-once-upon-a-time-i-tried

Youtube: https://www.youtube.com/watch?v=yRcbsS_rdgQ

[Undertale AU][Swapped Rhythms] In Times Gone by...

This replaces "Fallen Down (+ Reprise)"

Swapped Rhythms was created by: https://soundcloud.com/punniester-master_2019
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Also first "Fallen Down" recreation! I mostly used the "Heartache" instrumentation [Proteus] for this because using the original instrumentation would not be as fun as this to compose. Anyways... here's the original Fallen Down for SR: https://soundcloud.com/punniest-master_2017/swapped-rhythms-fallen-down
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Check out the entire playlist of Moon's musical rendition of Swapped Rhythms here: https://soundcloud.com/thesecondstrike/sets/undertale-au-swapped-rhythms

Source of Image: Couldn't find it unfortunately

Youtube: https://youtu.be/R289B4DJPas

[Undertale AU][Swapped Rhythms - Toriel] Heart of Kindness (+ Reprise)

This replaces "Menu"

Swapped Rhythms was created by: https://soundcloud.com/punniester-master_2019
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I tested the new "Magical8bitplugin" VST and I'm honestly really digging it! Anyways, here's my 2nd "Start" remix after the one I composed for my "Chara and Asriel Swap" project!
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Check out the entire playlist of Moon's musical rendition of Swapped Rhythms here: https://soundcloud.com/thesecondstrike/sets/undertale-au-swapped-rhythms

Source of Image: https://wolven0ne-universe.tumblr.com/post/176778132058/an-endlessabyss-guys-ill-open-commissionssss

Youtube: https://www.youtube.com/watch?v=v_CkezkS1Qo&feature=youtu.be

[Undertale AU][Swapped Rhythms] Select Screen (Full)

This replaces "Your Best Friend"

Swapped Rhythms was created by: https://soundcloud.com/punniester-master_2019
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Thought I could add more creativity into this.
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Check out the entire playlist of Moon's musical rendition of Swapped Rhythms here: https://soundcloud.com/thesecondstrike/sets/undertale-au-swapped-rhythms

Source of Image: https://www.deviantart.com/75312350312/art/flowey-668975632

Youtube: https://youtu.be/n5ilewHFvBc

[Undertale AU][Swapped Rhythms - Flowey] Flowey's Theme!

This replaces "Ruins"

Swapped Rhythms was created by: https://soundcloud.com/punniester-master_2019
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Check out the entire playlist of Moon's musical rendition of Swapped Rhythms here: https://soundcloud.com/thesecondstrike/sets/undertale-au-swapped-rhythms

Youtube: https://youtu.be/V-a3WxsFHIY

[Undertale AU][Swapped Rhythms - Area] Relics

Undertale by Toby Fox
Swapped Rhythms by FwugRadiation

FwugRadiation - SWAPPED RHYTHMS Soundtrack - 08 Pointless Lesson

You still have no idea who I am... Ok some things about me, just a really busy 16 year-old guy who's spontaneously producing au tracks. I take requests ocassionally or when i have more free time. i work on many aus (including someone's au) and several UT fangames. I make roleswap au tracks a lot more than crossover ones. I mostly make death by glamours, battle against a true heroes, heartaches, and asgores because those are my favorites and really fun to make. I don't make megalos (really sorry but I'm just not really into that) though I make custom genocide run final bosses at some point.

And here's my discord: MoonStriker#0730

QnA:

Q: Do you have any AU?
A: Yeah, I have: Rolled Cycle (Swapspin), Last Hope, and Underswitched. "Will I make songs for one of theses aus?" Someday, yeah. 
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Q: Can I use your musics for my au?
A: Sure! If the description of the certain music says that, then yes! I'm wary about Deltarune aus, though.
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Q: Do you have any song project?
A: I consider "Chara and Asriel swap" to be my primary music project. There's more such as "Chaos Kings" and "Doused Flames". Upcoming project might be "Toriel and Asriel Swap" or "Mettaton and Asgore Swap". I'm not sure, but you can decide which one too based on what you're interested with.
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Q: Do you take request?
A: Yes, but that depends or it'll take some time to actually do it.
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Q: What is your favorite UT music?
A: For battle theme: Battle against a True Hero goes to number one! Death by Glamour goes to second! And finally... ASGORE goes to third! Last but not least... Heartache or Spear of Justice? I don't know, both are on-par to me =P As for area theme, Waterfall and Another Medium for the win!

[Undertale AU][Swapped Rhythms - Flowey] Flowey's Theme!

MoonStriker (Archive II)