Final answer:
George Gershwin frequently collaborated with his brother, Ira Gershwin, who was a lyricist for many of George's compositions. Together, they created timeless music for Broadway and classic American opera.
Step-by-step explanation:
George Gershwin often collaborated with his brother Ira Gershwin. Ira was a lyricist who contributed to many of George's compositions, which resulted in numerous successful Broadway shows and songs during the 1920s and 1930s. Some of the most famous collaborations between George and Ira Gershwin include the classic American opera Porgy and Bess, as well as the popular songs 'I Got Rhythm' and 'Embraceable You.' Collaborating with his brother, George Gershwin made a lasting impact on American music, blending classical music with jazz influences to create works that are beloved to this day.