The title track was an era-defining description of how the sexual revolution was actually started by confused, recently divorced parents rather than their hippie offspring. Sinatra tired of the tune quickly, so he grabbed Nelson Riddle and built a quality album around the hit. Here, Riddle and Sinatra are in Count Basie mode, with a jazzy organ fronting a sleek big band. "Summer Wind" and "All or Nothing At All" are heralded classics, though the wondrous "On a Clear Day" may be the single most underrated tune in the entire Sinatra songbook.