Ideas for spooky-themed music?

We're setting up a mock murder-mystery play back at home, taking heavy inspiration from those 'whodunnit' films like Gosford Park and 19th century gothic-themed films like Dragonwyck. We're currently looking for classical 'spooky' themed soundtrack--but every time we tried to search, the internet just points the way to the works of Johannes Brahms, Bach, Mozart, and the guy who made "Night in Bald Mountain". Those kinds of music are good...but they are too strong for what we wanted.

We're working for something more--quieter, more noir-y. We bought a couple of songs which were from the Haunted Mansion in the disney theme parks, but they weren't selling much else.

So do you guys have any suggestions? What are the best spooky-themed music you'd think would suit a mystery-in-a-mansion story?