If you want thematic music, there's always the Cthulhu Carols sung by members of the HP Lovecraft Historical Society.
http://www.cthulhulives.org/solstice
I sent a copy of their "A Very Scary Solstice" to my sister one Christmas. It's possible that she's forgiven me for that by now, but my sending "Alien" for her birthday probably didn't help.