John Carney’s music-infused films – Once, Begin Again and Sing Street– chronicle lost souls tuning into one another via the art of song, and his latest, Flora and Son (B), sticks close to his finely tuned formula. Eve Hewson and newcomer Orén Kinlan are fabulous as the titular characters, a single mother and a troubled teenager looking for meaning in hardscrabble Dublin. Flora, estranged from her bassist husband (Jack Reynor’s charm makes him hard to hate) and in search of a higher calling, finds a California-based virtual guitar teacher, the roguish and rhythmic Joseph Gordon-Levitt, and soon the central quartet of characters gets its groove back through common craft. Despite the strength of the performances, the story and song quality aren’t quite up to the Carney measure of excellence, and the brisk tale somehow feels awkwardly truncated. Still, the way these characters connect has mountains of magic in it. Full of acerbic wit and Irish sting, Hewson is singular in her role and quite irresistible. She and Gordon-Levitt have undeniable chemistry. It’s now abundantly clear what to expect from a Carney film, and fans of the auteur should have plenty of humor and harmony to enjoy. (Sept. 29 on Apple TV streaming service)