Question: What year did the seventh musical by the team that wrote "Oklahoma" premier?
Sentence (from "Oscar Hammerstein II"): Hammerstein collaborated with numerous composers, such as Jerome Kern, with whom he wrote "Show Boat", Vincent Youmans, Rudolf Friml, Richard A. Whiting and Sigmund Romberg; but he is best known for his collaborations with Richard Rodgers, as the duo Rodgers and Hammerstein which include "Oklahoma!
Relevant evidence: Yes