Other music tracks not found in .ogg files include:
Runner Star Home (0:20)
Cheap Cutscene in a Cheap Edutainment Game (0:09)
How to Eat Cheese (0:33)
Meena Monna Moop (0:05)
My Brother is a Clown (0:05)
That Flips My Hat Backwards (0:18)
The Side Effects of School (0:05)
She Made a Mistake Right at the End (0:11)
Just Messin' Around (0:20)
Cheer for the Sport! (0:31)
New Thing Unlockabled! (0:13)
Baldi's Basics Plus Early Access Trailer Background Music (0:00-0:30 in the Trailer)
While most of these tracks (although not all) are used for mystman12's Kickstarter campaign video about Baldi's Basics Plus and are composed by mystman12's sister, the rest of these tracks are highly likely to be used for the full game upon its release. Besides the available OST video, the "Baldi's Basics Kickstarter Madness Soundtrack" album can be downloaded from Dropbox.
The music was made by using Music Maker that comes from an old software called Adventure Maker.
The music sounds like a .midi file which a lot of 90s games used to cut back storage space, although the music for Baldi's Basics was made to make the game feel more "90s" and nostalgic.
The music in Baldi's Basics Classic and all other demos, despite sounding like a .midi, is saved as .wav files in the game files. This is because mystman12 converted the .midi files to .wav since Unity doesn't support MIDI files.
In the full game, however, the MIDI format is recoded into the game. Only mus_school and mus_intro are using this format, however.
Baldi's Basics Kickstarter Video Soundtrack
Baldi's Basics Plus Early Access Trailer OFFICIALLY OFFICIAL