Almost all soundtracks from Baldi's Basics Plus. The only soundtrack I couldn't find was Event Notification (and I think the audio from the NINENINE Secret), so for now, I'll put Win in its place until I can find the track. If you manage to find the missing tracks please contact me. 

Baldi's Basics Plus soundtracks

Baldi's Basics Classic Remastered Original Soundtrack

That's Me!

BAD SUM

Tutorial theme from Baldi's Basics Plus.

Composed by Micah McGonigal (mystman12).

Baldi's Basics Plus - Tutorial

Baldi's Basics Plus - Camping Minigame (Tutorial)

A 1990's-styled nostalgia music plays at the start during the game (also for Baldi's Basics Classic, Baldi's Basics Birthday Bash, and the public demo). The track later loops, but will stop playing when the Player gets the answer wrong on either one of two beginning notebooks in the classic edition, and when Baldi starts his chase in the public demo.

School

The soundtrack for the music used while your in the elevator, which was added in the V0.2 update of Baldi's Basics Plus. Credit to Basically Games for creating the soundtrack.

Baldi's Basics Plus - Camping Minigame (Tutorial)

Mr Baldi