To see the trailer on your home computer, assuming it has that capability, go to the Internet Movie Database www.imdb.com and type in "A Mighty Wind'' in the Search Box on the upper left of the screen. Info about the movie will show up, along with directions to view the trailer.
Because I watched it at work I had to turn the sound off, but it sure had the look of one of those folkie retrospectives on PBS.
I read an article about Chris Guest which said he was once an aspiring folk musician, went to school with Arlo Guthrie and they remain friends.
The movie sounds hilarious and loving at the same time.