The dark art of leitmotivic analysis has been practiced in secret by occult sects since the murky depths of history by which I mostly mean a bunch of nerdy men with beards in the late 1800's. Today I join that hallowed lineage, armed with half a bachelor's degree in music theory, to uncover just how deeply (or... shallowly) Gaster's Theme has permeated Deltarune's soundtrack, and explore what such an infestation might imply for the game's story.

Is it really so simple you can hear it anywhere?
Is Rouxls Kaard secretly Gaster?
Will I end up in a boxing match with @MediaMotifs in the next Creator Clash?

Some of these questions AND MORE will be answered herein.

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ToffeeBun: ‪@ToffeeBun‬
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Sources list: https://docs.google.com/document/d/1O...

SOUNDTRACK (The video is segmented by the music I'm discussing. The background music is listed underneath):

Piano impromptu 0:00
What is Gaster's Theme? 00:12
Knock Knock (Hotline Miami OST)
Gaster's Theme (Undertale OST)
Gaster's Theme (SayMaxWell remix)
Let's Get Together Now (OMORI OST)
But what is Gaster's Theme REALLY? 2:49
Ant Village (Stray OST)
Demon In My F***in Head (Vargskelethor)
A Proper Story (Bastion OST)
sans (Undertale OST)
It's Raining Somewhere Else (Undertale OST)
The Song That Might Play When You Fight Sans (Undertale OST)
A Date With Demise (insaneintherainmusic)
Deploy the Diagram 5:51
A Monster (Furi OST)
Heartache (Undertale OST)
ASGORE (Undertale OST)
Spear of Justice (Undertale OST)
Undyne (Undertale OST)
Alphys (Undertale OST)
Here We Are (Undertale OST)
Checker Dance (Deltarune OST)
It's Showtime (Undertale OST)
Doctor (Homestuck OST)
Your Best Friend (Undertale OST)
Finale (Undertale OST)
Lavender Town (Pokemon Red/Green OST)
Where We Used To Play (OMORI OST)
Nocturne B. 108 in C Minor (F. Chopin)
The Temple of Magicks (Inscryption OST)
Konga Conga Kappa (Crypt of the Necrodancer OST)
Bonetrousle (Undertale OST)
Determination (Undertale OST)
Wrong Enemy (Undertale OST)
MEGALOVANIA (Undertale OST)
Underwater Highway (OMORI OST)
Such A Time We Had Together (OMORI OST)
About To Actually Start The Analysis 16:11
hmmm look what u done did you found a secret (Pizza Tower OST)
ANOTHER HIM 18:18
Filthy Nuclear Bunker (Hiveswap OST)
Scarlet Forest 19:24
Minish Woods Orchestral Arrangement (The Noble Demon)
Man 21:08
Alley Robot Room (Yume 2kki OST)
The Builder (Kevin MacLeod)
SquareSquare World (Yume 2kki OST)
Card Castle 22:52
Badededeline (Celeste Strawberry Jam OST)
Rouxls Kaard 24:02
On A Trip (Everhood OST)
April 2012 24:25
Silly Times Many Slimes (Celeste Strawberry Jam OST)
Chaos King 25:25
Darkness Falls 25:41
Esc (Binding of Isaac Antibirth OST)
Unreasonable Behaviour (Firewood remix)
Friendship 27:55
A Home For Flowers (Tulip) (OMORI OST)
THE HOLY 28:29
Sanctuary Guardian (Earthbound OST)
The Circus 29:12
Karkat's Theme (Pesterquest OST)
Happy Break Time :) 29:45
Mysterious Mario Paint OST
Alex Eagleston (YIIK OST)
The Final Battle (Everhood OST)
THE WORLD REVOLVING 30:31
Bready Steady Go (OMORI OST)
Limitless (Celeste Strawberry Jam OST)
Chapter 2 Intro 34:27
Mohg Lord of Blood (Nightwalk cover)
Girl Next Door 34:53
Lost Girl (Deltarune OST)
Open Embrace (Celeste Strawberry Jam OST)
Underwater Prom Queens (OMORI OST)
Queen 37:12
Baby Download (Stray OST)
WELCOME TO THE CITY 37:38
Termite Capitol (Bug Fables OST)
DineMite Beats (Bug Fables OST)
A CYBER'S WORLD? 39:13
Cool Mixtape 39:23
Elegant Entrance 39:31
Pandora palace 39:42
Attack of the Killer Queen 39:55
Mutation (Akira OST)
Giga Size 40:07
BIG SHOT 40:14
Spamton (Deltarune OST)
Dialtone 40:57
Blue's Theme (Everhood OST)
Flashback 41:20
Uwaa!! So Holiday (Undertale OST)
Uwaa!! So Temperate (Undertale OST)
Conclusion 42:05
Beast (Patricia Taxxon)
Departure (Cafe de Touhou 5)
Formations (FEZ OST)
The End 48:44
Hysterical (SharaX) + THE WORLD REVOLVING (Gooseworx remix)