The songs (written by Keegan DeWitt) were actually performed by the actors with all the vocals being recorded live (i.e. on-set) with each take (similar to Les Miserables, etc.)
Dave the Bartender (Ted Danson) is said to have appeared on Broadway in the play Status Quo Vadis. Danson actually appeared in that play on Broadway (which ran one performance in 1973), playing a bartender.
Hearts Beat Loud (2018) was filmed in Red Hook, Brooklyn, at locations including the coffee shop Baked and the bar Sunny's.
Hearts Beat Loud (2018) is an American comedy-drama music film based on a screenplay by Haley and Marc Basch, directed by Brett Haley. It stars Nick Offerman, Kiersey Clemons, Blythe Danner, Sasha Lane, Ted Danson and Toni Collette.