Simon and Garfunkel. Two every talented musicians, and a great duo. Fraught with infighting and personal angst later, it's almost like they were married. However, save the Carpenters (and look how well that turned out), not a loot of duos had true staying power. However, these two kings of New York had folk music down pat, the style of the late 60s early 70s.
Enjoy two of my favorites. I love the harmonies, the back beat and the simple stylings.
"Me and Julio down by the Schoolyard."
And a Sunday favorite, "Kodachrome."
-om