Best: "Raindrops Keep Fallin' on My Head" ('Butch Cassidy and the Sundance Kid,' 1969)
It was written by the great songwriting duo Burt Bacharach and Hal David for a movie starring the incomparable acting duo Paul Newman and Robert Redford about the great train-robbing duo of the title. And not surprisingly, the insanely catchy "Raindrops" was a smash hit for singer B.J. Thomas, whose raspy post-laryngitis vocals gave the carefree lyrics a lived-in feel. It's also a triumph for Bacharach, whose famously twisty chord progressions suit the song perfectly – a leisurely sonic stroll with no particular place to go.