Slight but savory, this is a road comedy about karaoke competitions, a potent and neglected subject, with three intercut stories about contenders en route to a contest in Omaha. Scripted by John Byrum (writer-director of the underrated Inserts and Heart Beat, not heard from in ages), and directed by Bruce Paltrow, this is largely cast with talented unknowns, apart from Angie Dickinson, Andre Braugher, and Paltrow’s daughter Gwyneth (Braugher and Paul Giamatti are especially effective). With Maria Bello, Huey Lewis, Scott Speedman, and Kiersten Warren. 112 min. (JR)