My top 5 versions of Beginning.
While my Undertale lists usually are Top 10s, Deltarune's smaller soundtrack and smaller pool of AUs to choose from (along with existing for less time) means that these lists are Top 5s instead. 
Note that despite Soundcloud's numbering system, the #5 pick is actually the one below the original, and the #1 pick is at the bottom. That way it functions like a countdown.

Some rules apply as always:
1. The song has to be for an AU.
2. Covers and takes are allowed, remixes are not.
3. Only one entry per AU. For example, a song and a cover of that same song or alternate version for the same AU could not both be there.
4. Any variations of "!Deltaswap" (or !Deltafell or whatever) all count as the base AU (i.e. Deltaswap). (Something like Deltarune: Switching Suits, however, could coexist on the list)

Slick's Top 5 AU Beginnings

exclusive music

Underrune

Anomalous (Fan Made Playlist)

Deltarune

Noelle:
*Asriel, why don't you try piecing these floating papers together?
Asriel:
*...I guess I can try.
*I hope you don't mind if I touch them, Frisk.
"Frisk nods gladly'

This is the "Legend" replacement

This is a Deltaswap take of mine and it is not for your AU. Please do not claim it as yours, although you are allowed to extend this song, provided you give credit to the original creator. Ask beforehand.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Introducing "PROSEMOOR". A complicated opposite of Deltarune itself. It's named that way instead of an anagram of Underswap or simply Deltaswap. The relevant swaps for now are listed below:
• Asriel - Kris
• Alphys - Toriel
• Noelle - Susie
• Rudy - Asgore
• Frisk - Ralsei
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Frisk takes the role of Ralsei. They are the figment of Asriel's imagination of "the kind of person/friend he'd always wanted to have". Much like Undertale, Frisk is a silent character, although they do talk on some occasion. They are very playful and friendly once you get to know them, although they are not all nice and good. Sometimes, they are mischievous, stubborn, and naïve. They can even be cold and menacing at times, but overall, they are just a silly fun-loving kid with a strong-willed character and many choices to make. They do cheesy, yet decent magic tricks in their hat. Some of them are actually adorable which put a genuine smile Asriel and Noelle's face.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Leitmotif:
-Nightmare Knight/Friendship/Door/The Chase
-Legend (concert arrangement)

Whether Deltaswap should exist or not at the moment. In the end, this is just a fun little project I'm making.

[Deltarune AU][PROSEMOOR - Legend] The Legend of Prosemoor

Asriel:
*Gee, are you sure there's anyone living here, Frisk?

"Frisk tells Asriel that no one is residing in this town"
*cue the no gesture*

Asriel:
*Okay... that totally explains why I didn't see anyone inside every building I checked beforehand.
*I suppose we best get going before that big buy hurts Noelle again!
*We gotta save her, Frisk!

"Frisk does the 'ready' pose"

This is the "Empty Town" replacement

This is a Deltaswap take of mine and it is not for your AU. Please do not claim it as yours, although you are allowed to extend this song, provided you give credit to the original creator. Ask beforehand.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Introducing "PROSEMOOR". A complicated opposite of Deltarune itself. It's named that way instead of an anagram of Underswap or simply Deltaswap. The relevant swaps for now are listed below:
• Asriel - Kris
• Alphys - Toriel
• Noelle - Susie
• Rudy - Asgore
• Frisk - Ralsei

• Empty Town - Card Castle
• Scarlet Forest - Field of Hopes and Dreams
• The Cliff - The Great Board
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Frisk takes the role of Ralsei. They are the figment of Asriel's imagination of "the kind of person/friend he'd always wanted to have". Much like Undertale, Frisk is a silent character, although they do talk on some occasion. They are very playful and friendly once you get to know them, although they are not all nice and good. Sometimes, they are mischievous, stubborn, and naïve. They can even be cold and menacing at times, but overall, they are just a silly fun-loving kid with a strong-willed character and many choices to make. They do cheesy, yet decent magic tricks in their hat. Some of them are actually adorable which put a genuine smile Asriel and Noelle's face.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Leitmotif:
-Nightmare Knight/Friendship

Whether Deltaswap should exist or not at the moment. In the end, this is just a fun little project I'm making.

[Deltarune AU][PROSEMOOR - Area] Lonely Kingdom

===== NOTES =====
man in terms of songs related to them Kris(-replacements) kinda get absolutely Cunked

totally didn't take inspiration from prosemoor for the idea behind the track nope nuh uh nope 
(check prosemoor out btw it's really good: @delta-swap)

Anyways @thedboy is the Kris replacement for this AU

bout time i reveal that

===== CREDITS =====
Last motif composed by: @austhetic!

[BATHRUNE: Tale of Da Hoe Club] The Walk Back Home

I like skeletal smash, that's all
..
..
Original by BDV/DropOff
Thumbnail by ts_sheep
ok

Integrity | Skeletal Smash (Cover)

Music by me

Original : https://soundcloud.com/tacosans/velocity_v2_speedy_megalo
Original by : @imtoxicwasteofficial
Concept/Self-insert : @tacosans
Thumbnail by me
Thumbnail inspired by : @siderdude / @aiueosoftboi


please notice me

Velocity | A Speedy Megalo FaDeD (Cover)

Music by FaDeAWAY
Orignal by MisterKaze Presents
Original : https://soundcloud.com/misterkaze/wonderful-idea-phase-3-gaster-blaster
MIDI by FaDeAWAY
Thumbnail by FaDeAWAY

UNDERTALE: Wonderful Idea | Gaster Blaster FaDeD

collab LM
His stuff are great, go check and follow him! @fade-away-863527735
Original and midi by @jedotime
Thumbnail by me because that's the reason
I dont know what to say more, so enjoy! (what)
(I shouldn't use this drum)

Jedo | Time Paradox [Ft.FaDe AWAY]

Music by FaDeAWAY

Credits:
Dream SMP - L'AMENTFUL (Pikart767) - https://soundcloud.com/pikart767/lamentfull
Dream - Atychimania (CynicalAxiom) - https://www.youtube.com/watch?v=a8ihZHwPOso
Tommyinnit - Androphobia (MayonnaiseSMT/crimsonluigi) - https://soundcloud.com/crimsonluigi/androphobia-v3-tommyinnit-megalo
George - Oneirophobia (By Sammy) - https://soundcloud.com/haisammy/oneirophobia
Tubbo - Pistanthrophobia (MayonnaiseSMT/crimsonluigi) - https://soundcloud.com/crimsonluigi/pistanthrophobia-a-tubbo
Ranboo - Trepidation (Cactuarcity) - https://www.youtube.com/watch?v=UObbJ1IfVik
Fundy - Encryptage (Speedy) - https://soundcloud.com/tacosans/encryptage-an-itsfundy-megalo
Technoblade - Orphan Obliterator (Krajoz) - https://soundcloud.com/krajoz/orphan-obliterator
Wilbur - Virulence (CynicalAxiom) - https://www.youtube.com/watch?v=Eoc2raes2aw
Sapnap - Snapping The Sapling (915) - https://soundcloud.com/axel-915/shifted_invation-snapping-the-sappling
Skeppy - Was it worth it? (Solunary)- https://soundcloud.com/solunary/was-it-worth-it-a-skeppy-megalovania

Art found at : https://psikologwallpaper.blogspot.com/2021/06/lmanburg-flag-burning-fanart.html

The "Dream SMP" Omnilovania [V2] [600 Followers Special] [CRINGE]

DELTARUNE Chapter 1 (Original Game Soundtrack)

Beginning

ENTER ANOMALOUS

BEGINNING

The School

Papyrus

The DOOR

An Anettshift "Kris"

Motifs:-
- Original

Roleswap: Frisk - Gaster / Kris - Lancer

Original Mix: https://youtu.be/tp3SUWayLCY

[Anettblur x Deltashift - Anettshift] Frisk

* Hey! Frisk!
* It's time to wake up and face the world!

002 - Daily Routine

003 - Education

update: i WILL remix a song or two from chapter 2.
update 2: i did a remix of a chapter 2 song :)
The original song is so good. The game is great as well, and it's also free. Do absolutely give it a shot: https://www.deltarune.com/

Deltarune - Rude Buster (Mel's remix)

Played the first chapter of Deltarune, loved it. Now this exist. You're welcome.
Don't take anything of this seriously, it's not for a Deltarune AU.

EDIT: Amazing thumbnail by @nelchael-recabarren, art in the thumbnail - http://rnother-hen.tumblr.com/post/179662474707/ra-ra-ralsei
Title suggestion by @aldreiy-pablo and @redtenx

[Ralsei Hopes and Dreams] - Illuminated Darkness / Light and Dark

More Deltarune for you all!, this time putting a spin on this song, I hope you all enjoy it♥

-------------------------------------------------------------------------------------

My Patreon: https://www.patreon.com/NahuPyrope

My Bandcamp: https://nahupyrope.bandcamp.com/

My Spotify: https://open.spotify.com/artist/3d0FQ...

My Twitter: https://twitter.com/NahuPyrope

My Soundcloud: https://soundcloud.com/nahupyrope

Newgrounds: http://nahupyrope.newgrounds.com/follow

Thanks so much for listening to my music!

Lancer - Deltarune Symphonic Rock Cover

youtube: https://youtu.be/nM_W_1vUFSY

so deltarune put a little bit of new life in me in terms of composing. i absolutely love it's soundtrack and i'm probably gonna make quite a few remixes of it.

Deltarune - Lancer's Theme (Metal / Rock Cover)

it was bound to happen at some point
i feel like my mixing's a bit off, i gotta fix my trousle flp sometime :P
art by: https://soundcloud.com/mavalovania ily bb <3

when you lancer trousle epic style

* Stefan, it’s a beautiful morning isn’t it?
* I can’t wait for next week when your brother, Kryo, visits.
* Although, I ponder, will he still enjoy returning to this town after University?
------------------------------------------------------------------------------------------------------------
track number 2!

deleted fate by - @taeskull, @fredbear247, and @kryogenesys.

BEGINNING

anomalous OST