9. Lee Hazelwood & Nancy Sinatra
Deep-baritoned writer-producer Lee Hazelwood revived Nancy Sinatra's flagging career with "These Boots Are Made for Walkin'" in 1966. The unlikely May-September couple ("I had a horrible crush on him, but he was married then," she recalled decades later) subsequently reconvened for a pair of sonically ambitious, esthetically odd, and commercially successful albums. While Nancy & Lee (1968) contained spunky hit "Jackson" and morning-after masterpiece "Some Velvet Morning," 1972's Nancy & Lee Again was more sophisticated, with anti-war tracks like "Congratulations" bumping up against Norman-Rockwell-on-acid slices of American life like "Tippy-Toes." And fans of sexual tension will surely appreciate Lee's subtly sardonic ad-libs and Nancy's girlish giggles.