What This is Spinal Tap did to rock music, so does this faux documentary do for folk music. When a famed folk impresario dies, his clueless son stages a tribute concert. Among the once-popular groups reunited include the Folksmen (Spinal Tap veterans Michael McKean, Christopher Guest, and Harry Shearer) and the long-estranged folk duo Mitch and Mickey (Eugene Levy and Catherine OHara). Mock documentary that follows three folk bands as they reunite for a benefit performance for a deceased concert performer.