If you've ever seen a Christopher Guest movie, you'll know exactly what you're in for when you pop in "A Mighty Wind." There's the initial meeting of all the individual characters, they get together, there's a hilarious climax involving all of them (a dog show, a local play, in this case a concert) and then we flash forward to see how they're all doing now! Knowing that, you can have a great time with these zany folks, and marvel at the improvisation they all do. There's a lot of silly stuff in here, but most of it works. Eugene Levy, who wrote it with Guest, is of course the standout among these talented comedians. Some adult humor, but fine for younger teens.