In order to accurately capture the Victorian era, composer Chris Vrenna disallowed himself from using modern instruments.

The soundtrack was largely composed using instruments of the time, such as zithers and autoharps, toy instruments, and various children's toys, such as jack-in-the-boxes. Ambient noise and strings were then added to the songs to give the songs a more creepy feeling.

In order to make the music more organic sounding, Vrenna built the rhythms of the songs based on various environmental samples such as clock ticking, ratchet noises, and door slams.