Christmas has many songs and carols that begin playing earlier every year it seems, but Thanksgiving has hardly any musical offerings. One of the very few Thanksgiving songs is Arlo Guthrie’s Alice’s Restaurant Massacree. And by Guthrie’s own admission, it isn’t really about Thanksgiving at all. It’s a long diatribe against absurdity, stupidity, with a passing swipe at the draft and the Vietnam War. The events described in the song (cold, hard facts, actually) really happened but the timing of some of the events were during the Thanksgiving holidays, setting the stage . . .