Another track is used on backgrounds in the Baldi's Basics Plus early access trailer from 0:00 to 0:03.
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 Cady McGonigal, the rest of these tracks are highly likely to be used for Baldi's Basics Plus 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 the Baldi's Basics series was made to make the game feel more "90s" and nostalgic.
The music in all games excluding Baldi's Basics Plus, 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 does not support MIDI files.
In Baldi's Basics Plus, however, the MIDI format is recoded into the game. Only "School", "Intro", "Dance" and elevator theme are using this format, however.
Some of the music sounds rather repetitive. It may be a reference to when ejecting a CD-ROM while a game is running, most of the music will be reduced to only a few notes, repeated.
In Baldi's Basics Plus, there are some unused files for the MIDI format such as "Learn", "LearnFixed", "TransitionTestLoop", "TransitionTest", "SlapTest", "SlapTestSilent", "TeaserSlap", etc.
A part of the 99 soundtrack appears to be a parody of Mary Had a Little Lamb.
Despite the midi tracks being made in a music program, every song in the Kickstarter Madness Soundtrack was played on a Casio brand keyboard as it produces those sounds. These tracks are the only ones that were not made with a music program, and are also the only tracks to be recorded with a mic to be in the game.
The instrument for Creepy Old Computer for example, uses the Space Pad instrument on this keyboard.
The keyboard used was most likely dated to be made in the late/early 90s as the newer keyboards do not produce the same sounding instruments, which might be the reasoning to why it was used for the soundtrack.
Since the music has been changed to MIDI fromat, some glitches may occur. In particular, sometimes many music notes will play all at once in the intro.
Baldi's Basics Kickstarter Video Soundtrack
Baldi's Basics Plus Early Access Trailer OFFICIALLY OFFICIAL
↑"I used a program called Music Maker that comes with this old software called Adventure Maker." - mystman12. May 27, 2018. Twitter