Renaissance Fare: Crosby, Stills and Nash's debut album

NOW AND THEN, and not very often at that, there's a pop album that stands head and shoulders above the rest, one so characteristic and distinctive that it defies competition or comparison. It doesn't appear from out of nowhere; actually it may be rather predictable. When it is finally released, it is a source of the affirmation and joy which is the lifeblood of rock 'n' roll.