Tracks that are not in the ost. Either found in the files, in game, or provided by Toby himself. Will also be adding some music that was made for other projects but is referenced in deltarune/undertale.

Unused/bonus/ambient undertale/deltarune tracks

From: https://www.youtube.com/watch?v=phOsFLw4L88 
Also, yes, I am back! Now operating on Tumblr!!! https://www.tumblr.com/obscuretobyfox

Ice Cream

"After creating UNDERTALE, one of my goals for DELTARUNE was for players to finally be able to challenge a "real" version of Mettaton NEO that didn't just end in one turn. For that purpose, I actually created a few music mockups for an extended version of Power of NEO.

There's even another one from 2016 (lol)

… Unfortunately, try I might, I could never create a full-length version of the song that I was satisfied with. Eventually, the boss concept evolved to involve Spamton, and with that, the music changed as well.

I still like the last half of the song. The guitar section was inspired by Brandish's song "Ending 2". All of it is pretty placeholder though.

It's still fun to imagine fighting something to this... Though, if I was given another opportunity to extend POWER OF NEO, I would probably do something different." - Toby Fox

Power Of NEO (Unfinished)

One of the songs that play in the Sound Test room.

Toby Fox - UNDERTALE Soundtrack - Unused: Gaster's Theme

Not in the game's files. It was originally supposed to play during the Undyne battle but was later replaced with Spear of Justice because it didn't reflect Undyne's personality very well.

Toby Fox - UNDERTALE Soundtrack - Unused: Undyne Battle

Not in the game's files. It was replaced with the current version of the song.

Toby Fox - UNDERTALE Soundtrack - Unused: Undertale

Not in the game's files. Was originally supposed to be for Homestuck. It uses the Doctor leitmotif. The later half of the song was used in Another Medium.

Toby Fox - UNDERTALE Soundtrack - Unused: Patient

Was supposed to play when Madjick used his orb attack. It caused bugs with the music and Toby Fox just got rid of it.

Toby Fox - UNDERTALE Soundtrack - Unused: Star

A regal version of Determination. Was probably used with Asgore, specifically his description.

Toby Fox - UNDERTALE Soundtrack - Unused: King Description

Not in the game's files. Was supposed to play if you finished the game fast enough. Accompanied with a dog in a bikini.

Toby Fox - UNDERTALE Soundtrack - Unused: Dogtroid

Toby Fox - UNDERTALE Soundtrack - Unused: Dog Hole

Not in the game's files. Was originally used for Alphys' lab, but was replaced with Alphys because it sounded too much like a lab song from another game.

Toby Fox - UNDERTALE Soundtrack - Unused: Alphys' Lab

Toby Fox - UNDERTALE Soundtrack - Bad

Toby Fox - UNDERTALE Soundtrack - Dog Room

Toby Fox - UNDERTALE Soundtrack - Mushroom Dance

Toby Fox - UNDERTALE Soundtrack - Wrong Number!

Toby Fox - UNDERTALE Soundtrack - Snore Symphony

Toby Fox - UNDERTALE Soundtrack - Mad Dummy Intro

Toby Fox - UNDERTALE Soundtrack - Wind

I'm bored lol

(just in case you're wondering what this even is)
https://www.youtube.com/watch?v=XaXR7G6UxE4&feature=youtu.be&t=20s

Also I'm going to hold off from music for a bit because I'll be busy/waiting to get new headphones

Undertale - PAPYRUS' COOL SONG [Kickstarter] (recreation)

VS Mad Mew Mew (Undertale for Nintendo Switch)

Just a dude who makes playlists with stories, and archives songs I like. mostly about undertale fan games/ideas that I come up with. (If you want your song removed just say so. No need to be a dick and claim I’m stealing your stuff.)

Unused/bonus/ambient undertale/deltarune tracks

Dexter the Cat