LOS ANGELES (AP) — In the span of American pop music, few performers have gone as unrecognized as the backup vocalists who harmonize and contextualize the songs of many a heralded lead musician. With “20 Feet From Stardom,” some of the most notable finally get their due, but more than a tribute, the film is a recognition of the talent and sacrifice that many of these vocalists have invested in often challenging careers.
