The horror music in SpongeBob SquarePants includes "Graveyard Shift" and "The Monster".

1. "GraveyardShift" - Created by SageGuyton and Jeremy Wakefield, this is a classic SpongeBob horror music, often used at night or in scary scenes.

2. "TheMonster" - Created by SageGuyton, this song is usually played in some scary plots, such as Spongebob having nightmares and complaining about the tumor monster on the beach.