An ambitious young female singer moves to New York City in search of stardom, but finds only disappointment until falling for a struggling record-industry executive who helps her down the road to fame. Songwriting duo Gretta (Keira Knightley) and Dave (Adam Levine) had been dating since college when they decided to seek their fortune in NYC. When Dave is signed by a major label, temptation proves too powerful for him to resist and the couple call it quits. Crestfallen, Gretta fights to get back on her feet until one night, while performing in the East Village, she catches the attention of Dan (Mark Ruffalo), a once-respected music executive who's since fallen on hard times. Enchanted by Gretta's powerful voice and skillful songwriting, Dan convinces her to join him in a collaboration that will transform them both over the course of one unforgettable summer. Written and directed by John Carney (ONCE, ZONAD).