In a video message on his Web site, Brad Paisley is asking fans and amateur filmmakers to create a music video for “Start a Band,” using green-screen technology. He has already filmed his portions, but users can change the backdrop and add themselves to the video. The grand prize is a Sony high definition camcorder and an autographed copy of Paisley’s latest album, Play. Ten runners-up will each receive a Flip Video camcorder and an autographed album. The contest concludes on Jan. 19.