Without ever raising the decibels above “pleasant,” this 2006 Irish movie beautifully chronicled Glen Hansard and Marketa Irglova's characters as they learned to make beautiful music together, in every sense of the word. There are no big dance numbers, in fact “Once” is notable for being one of the few films where the music feels like a natural extension to the acting as no one ever spontaneously just bursts into song or happens to find themselves near a piano for no good reason. It's a lovely, gentle film about the transformative powers of love and music and how intertwined they can be. It clearly translated well on Broadway too.