In one scene the music that is playing is the scene from Stanley Kubrick's "The Shining." Lens Waithe, who plays Ash, also played Aech in the movie, "Ready Player One," where they had to complete a puzzle set in a virtual reality version of the Overlook Hotel from "The Shining."
At 37-39 minutes in - the acoustical score being played is a rendition of David Bowie's "Space Oddity".