Frank Fisher, a former musician who lost his wife in a biking accident, owns a failing vinyl shop called Red Hook Records in Brooklyn, New York. His daughter Sam is slated to leave for the West Coast to study pre-med at the end of the summer. Despite Sam's desire to study and spend time with her girlfriend, Rose, Frank incessantly urges her to play music with him. During a jam session, Sam reveals she wrote a song titled “Hearts Beat Loud”. They spend the night recording and mixing the entire song. Frank uploads the song to Spotify without Sam's permission and it becomes a viral success. Frank tries to convince Sam to start a music duo, but the latter is reluctant, defiant on becoming a doctor. Regardless, Frank adopts an off-beat band name “We’re Not A Band” from Sam's refusals. Sam secretly writes another song about her relationship with Rose called "Blink (One Million Miles)", while Frank writes "Everything Must Go", about his closing business. In the meantime, Frank's landlady and loyal customer, Leslie offers a proposition to save Red Hook by remodeling it with a café to potentially lure more customers, to which Frank is stubbornly hesitant.