Alacrity

Dude, these lyrics were hard to find. But so worth it. Thanks google and this person.

H-A-double L -O-W- double E -N spells Halloween
H-A-double L -O-W- double E -N spells Halloween!

Halloween means ghosts and goblins, Skeletons, monsters and howling cats,
Spooky masks and jack-o-lanterns, Witches and devils and big black cats.

H-A-double L -O-W- double E -N spells Halloween (2x)

Trick or treat gets you candy and apples, Scaring the people who open the door.
Something here that they've omitted, then go to the next house and get some more!