Paul Rudd and Nick Jonas hit the right notes in 'Power Ballad'

UNITED STATES — Let’s just say that the wedding band has never occupied the most exalted rung of the ladder in music. Playing “September” and “Celebration” is often what’s most required. As one member of the Bride and the Groove, the band at the center of John Carney’s new film, puts it: They’re not rock stars. They’re human jukeboxes. But in “Power Ballad,” a wedding band singer and pop star cross paths. For one night, all