"Halloween is Coming" is an original song sung by The Chipmunks in the Halloween special, Trick or Treason, and has yet to be released as part of an Alvin and the Chipmunks album.
Lyrics
The Chipmunks:
Play some tricks, get some kicks
Halloween is coming
Make a dare, are you scared?
Trick or treat, a trick on you
When flying goblins make (ooh, ooh)
Weird shadows on the wall
Ghosts outside the door
Monsters in the hall (hall)
When coffins open (ooh, ooh)
And the bell begins to toll
Then it's time to party
Time to rock and roll!