Louis Armstrong (August 4, 1901– July 6, 1971) was an American jazz musician. 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. Probably the most famous jazz musician of the 20th century, he first achieved fame as a trumpeter, but toward the end of his career he was best known as a vocalist and was one of the most influential jazz singers.

http://en.wikipedia.org/w/index.php?title=Louis_Armstrong