Which of the following statements is not true? gershwin spent the last years of his life composing his most extended work, "porgy and bess," which he did not live to see performed. gershwin's 'rhapsody in blue" employs jazz-like rhythms and melodies. gershwin's career as a composer of music for the concert hall was launched by the triumphant premeire of his 'rhapsody in blue" in 1924. gershwin dabbled in many styles including expressionism and atonality.