Information:  - Ira Gershwin (December 6, 1896 August 17, 1983) was an American lyricist who collaborated with his younger brother, composer George Gershwin, to create some of the most memorable songs of the 20th century.  - Guy Reginald Bolton (23 November 1884  4 September 1979) was an Anglo-American playwright and writer of musical comedies. Born in England and educated in France and the U.S., he trained as an architect but turned to writing. Bolton preferred working in collaboration with others, principally the English writers P. G. Wodehouse and Fred Thompson, with whom he wrote 21 and 14 shows respectively, and the American playwright George Middleton, with whom he wrote ten shows. Among his other collaborators in Britain were George Grossmith Jr., Ian Hay and Weston and Lee. In the U.S., he worked with George and Ira Gershwin, Kalmar and Ruby and Oscar Hammerstein II.  - Lady , Be Good ( title sometimes presented with an exclamation point ) is a musical written by Guy Bolton and Fred Thompson with music by George and lyrics by Ira Gershwin . It was first presented on Broadway in 1924 ; the West End production followed in 1926 . The story of the musical is about a brother and sister who are out of money ; both are eager to sacrifice themselves to help the other . This was the first Broadway collaboration of the Gershwin brothers , and the Astaire siblings play a brother - sister dance team .  - Oscar Greeley Clendenning Hammerstein II (July 12, 1895  August 23, 1960) was an American librettist, theatrical producer, and (usually uncredited) theatre director of musicals for almost forty years. Hammerstein won eight Tony Awards and two Academy Awards for Best Original Song. Many of his songs are standard repertoire for singers and jazz musicians. He co-wrote 850 songs. Hammerstein was the lyricist and playwright in his partnerships; his collaborators wrote the music. 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, which include "Oklahoma!", "Carousel", "South Pacific", "The King and I", and "The Sound of Music".  - Kalmar and Ruby refers to the famous songwriting team of the first half of the 20th century of Bert Kalmar and Harry Ruby.    Given the paragraphs above, decide what entity has the relation 'composer' with 'george gershwin'.
Answer:
lady