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Though "Halloween Hootenanny" and "The Nightmare Before Christmas" Soundtrack would definitely work for an adult Halloween party, mix in these scarier soundtracks for an extra-eerie atmosphere.
Midnight Syndicate's "The 13th Hour":
Midnight Syndicate combines eerie sounds and atmospheric music with dark melodies. It makes great background music at a Halloween party and makes the perfect soundtrack to personal ghost stories.
The creepiest part about this soundtrack is the haunting melodies of a childrens choir which run through most of the songs. It's sure to set the perfect mood for a scary Halloween eve.