After a career spent exploring transcendent friendships sparked by music, Carney directs Paul Rudd and Nick Jonas in a story that gives the ugly side of human nature a fighting chance. John Carney loves to play his greatest hits . It no longer feels novel to point out that the Irish filmmaker launched his career with a movie called “Once” and then proceeded to tell the exact same story for a second time on his sophomore film “Begin Again.” Now that he’s done the routine a few more times, we can’