Final answer:
The first musical to win the Pulitzer Prize in drama was Of Thee I Sing.
Step-by-step explanation:
The first musical to win the Pulitzer Prize in drama was Of Thee I Sing. It was composed by George Gershwin, with lyrics by Ira Gershwin, and a book by George S. Kaufman and Morrie Ryskind. The musical premiered in 1931 and won the Pulitzer Prize in 1932. It is a political satire that tells the story of a presidential candidate who falls in love with the wrong woman.