If you ever want to understand the difference between a musician and a rock star, watch Gregg Allman as the saloon owner (who may or may not be a drug kingpin) in “Rush” (1991). Dude has only five lines of dialogue, but he owns the whole damn movie. Nobody ever said more by simply strutting through a doorway, hair and charisma flowing equally and in all directions. The movie itself is kind of bleak, as undercover cops get high on their own supply. It should have been the vehicle that catapulted Jason Patric into stardom. Instead, his career went undercover.