Not a lot of people know this, but the phrase "Something Wicked This Way Comes" came from the Shakespeare play Macbeth.
Over all I think this will be a perfect theme intro at the entrance, because it is based off of the Shakespeare play.
Not only does this have creepy music in the background, but the pretty melodious voice beckons young children to an unknown place. Plus this song is from the movie Hocus Pocus. In that movie, one of the witches is putting all the children in a trance to follow her to their doom.
This would be perfect for background sounds or more preferably the tunnels.
Ok, creepy piano lullaby music! Enough said!
And of course this one from NY's Sleep No More