Working quickly after the success of “Mr. Tambourine Man” and their debut album, The Byrds confirmed their place in the new folk-rock vanguard with an equally confident follow-up. Adapted from Pete Seeger’s own adaptation of the Book of Ecclesiastes, “Turn! Turn! Turn!” provided a hopeful salve for listeners in troubled times. Two more Bob Dylan covers and originals like Gene Clark’s stately “If You’re Gone” saw The Byrds refine their signature mix of jangle and harmony while also providing a preview of country rock.