1956 film for which Yul Brynner won a Best Actor Oscar (3,4,3,1)
I believe the answer is:
the king and i
(Other definitions for the king and i that I've seen before include "Bangkok-setting musical" , "Musical set in Siam" , "Rogers & Hammerstein musical" , "Musical set in old Thailand" , "Rodgers and Hammerstein musical" .)