Music for the Monsters
Halloween parties need music. Classics like "Monster Mash," "The Purple People Eater," "Love Potion #9," "I Put A Spell on You," "Time Warp," and "Werewolves of London" are winners with children of all ages. Some other suggestions: theme music from Ghostbusters, or Lemony Snicket's A Series of Unfortunate Events are all fun.
Sound effects tapes and CDs are available from most places that sell Halloween supplies—just make sure that it is age appropriate.