Hair and style

John Carney's “Once” was the kind of deft balancing act that couldn't be done twice — an intimate, ragged and touching slice-of-life musical made on a shoestring budget with non-actors who wound up winning an Oscar for the song “Falling Slowly.” So when Carney returned with another movie based around music and a cast that includes Keira Knightley, Mark Ruffalo and singer (and “Voice” coach) Adam ...