You mean the record player right? Side A is a rough demo of a song from when I recorded an album for a friend of mine (Chris, who is also the writer for much of the text in this game). This is the finished song if you're interested, it doesn't sound much like the demo, mind: https://soundcloud.com/c-sellers/sleeper?in=c-sellers/sets/rough-house
I'll get the soundtrack uploaded somewhere at some point, so you can hear that record player song without it cutting out whenever lightning strikes.
In case you meant the music box in the attic, all the songs the music box and piano play are generated per game session, so they're different for every player.