Louis Daniel Armstrong (August 4, 1901[1] – July 6, 1971) (also known by the nickname Satchmo, for satchel-mouth and Pops) was an American jazz musician. Louis Armstrong was a charismatic, innovative performer whose musical skills and bright personality transformed jazz from a rough regional dance music into a popular art form. One of the most famous jazz musicians of the 20th century, he first achieved fame as a trumpeter, but toward the end of his career Louis Armstrong was best known as a vocalist and was one of the most influential jazz singers.