British songwriter Gretta (Keira Knightley) is adrift in Manhattan after getting dumped by her philandering rock star boyfriend (Adam Levine). While playing at an open mic night at a local bar, she is discovered by struggling music producer Dan (Mark Ruffalo). Sensing her songwriting potential, Dan pushes Gretta to sign with him and record an ambitious outdoors album all across the city.
Sometimes, you only get one chance to follow your dreams. So, when a brokenhearted street musician clicks with a beautiful and feisty keyboardist, the unlikely couple decides they have nothing - and everything - to lose. Over the course of one electric week, the duo writes, performs and records an incredible cycle of songs every bit as spontaneous and soulful as their improbable romance. This truly unforgettable blend of transcendent pop music and raw, naturalistic storytelling is absolutely mesmerizing, because something this passionate and original comes along only... Once.
