NEW YORK -- Chrissie Hynde wouldn't make her own mark in music until a few years later, but her memories of how 1971's daily soundtrack was tied to the times remain vivid.“Music said something,” the Pretenders' leader and Rock and Roll Hall of Fame member says at the start of “1971: The Year That Music Changed Everything,” an eight-part documentary series that premieres Friday on the Apple TV+ streaming service.Hynde had just dropped out of Kent State University in Ohio, where a year earlier