All the soundtracks from Bladder's Simples in Education School - Scary Gran. The Playtime theme I added is the only one that sounds a little bit like the one from the game (the game's one is a bit distorted). 

Bladder's Simples in Education School - Scary Gran soundtracks

Ambience

All soundtracks from Baldi's Basics in Education and Learning. 

Baldi's Basics in Education and Learning soundtracks

Baldi's Basics Classic Remastered Original Soundtrack

That's Me!

mus_Learn

noise

Loud Noise 3 Loop

Loud Noise 3

LoudNoiseIntroLoop

Quiet Noise Loop

Tone

The music is merely a retro-styled music box. The jingle serves as Playtime's theme when she's nearby. In the basic version, the jingle appears to be a combination of several nursery rhymes; "Ring around the Rosie", "A Tisket, A Tasket", and "It's Raining, It's Pouring". In Baldi's Basics Birthday Bash, it is vaguely based on the "Happy Birthday to You" theme song.

The base music's notes are as follows, with a dot representing a pause:

G, F, . D, G, F, . D, D#, F, F, D, G, F, D, . D, D#, C, C, C, D#, C, C, C, F, D#, D, C, D, . A#

Playtime's Theme

It plays before the silence when the Player got the answer incorrect while using the You Can Think Pad at the beginning of the game.

Hang

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.

Loud Noise 3

Baldi's Basics All Sounds