There's a gajillion - but here are some I've used this year:
Mancini "Experiment in Terror"
Lee Evans "Goblins"
Gounod, "Funeral March of the Marionette"
Joyce Schatz Pease, "Tricks and Treats", Myklas
Kevin Costley Intermediate, "Phantom of the Haunted House" FJH
Martha Mier, elementary, "Creepy Creaky Sounds" Alfred
Martha Mier, elementary, "Witch on a Super Speed Broom" Alfred
Poe, elementary, "The Ghost Next Door"
Martha Mier, elementary, "Midnight Shadows" Alfred
Kevin Olson, elementary, "A Ghostly Tail" FJH
Faber, elementary, "Pumpkin Boogie" FJH
Faber, Intermediate, "Halloween Sonatine"