The Gravedancers

When three old friends reunite over another friends' death, they decide to pay proper tribute. After copious amounts of drinking, they go to their recently departed friends' grave to find a note with what look like song lyrics on it. In their drunken stupor, they dance around, singing the song on the note, and eventually stumbling out of the cemetery. But it turns out the words were actually an ancient spell, and they've awoken the dead.