Louis Armstrong was an American trumpeter, composer, singer and actor who was one of the most influential figures in jazz during the 1920s. He was born in 1901 in New Orleans, where he learned to create a unique sound and incorporate singing and patter into his performances. In the early 1920s in Chicago, Armstrong's band was among the most influential jazz bands of the time, helping establish Chicago as the center of the jazz universe. Armstrong had a significant impact on jazz in the 1920s through his emotional and expressive playing that others emulated, and his popularity grew such that his band became the most famous in the United States.