What musicals are based off of an opera?

- Hello, Dolly! (based on Thornton Wilder's The Matchmaker, which was based on Johann Nepomuk Nestroy's Einen Jux will er sich machen (1842) which in turn was based on Giuseppe Pergolesi's La serva padrona (1733))

- West Side Story (based on William Shakespeare's Romeo and Juliet, a play often used as a libretto for various operas)

- South Pacific (based on James A. Michener's Tales of the South Pacific, which was based on Gilbert and Sullivan's The Mikado (1885))