In Irish writer-director John Carney’s musical comedy-drama Begin Again, released last year, troubled New York music executive Dan (Mark Ruffalo) sees young songwriter Gretta (Keira Knightley) perform at a downtown open mike session and, smitten with her music, gives her his card. He promises that with a bit of production pizazz and a half-decent video (maybe a Norah Jones vibe) she could have a real radio hit. Gretta rejects his commercialising instinct. She just wants to be real – let the songs speak for themselves and all that. The haggard but good-hearted Dan finds her idealism endearing and naive. ‘Name…