George Gershwin and Ira Gershwin were brothers who were both prominent figures in the American music industry. George was a composer and pianist, while Ira was a lyricist. Together, they wrote some of the most iconic songs of the 20th century, including 'Rhapsody in Blue' and 'I Got Rhythm'. They also collaborated on several Broadway musicals, such as 'Porgy and Bess'. Their work has been influential in the development of jazz and popular music.