Simon & Garfunkel's fourth album takes on psychedelic influences, the changing cultural climate of the ’60s, and their own ever-growing ambitions. Side One forms a cycle-of-life suite, from the chaotic "Save the Life of My Child" to the youthful wanderlust of "America" to the autumnal reflection of "Old Friends." Side Two finds the duo at their trippiest on "Fakin' It," their most whimsical on "At the Zoo," and their most rocking on "Hazy Shade of Winter." And we haven't even mentioned "Mrs. Robinson"…