American jazz musician (1900-1971). He is considered by many to be the greatest jazzman ever, thanks to his astounding technical ability, his quick musical mind, and the joy he brought to his music.

Born in New Orleans to a very poor family, Louis (nicknamed "Satchmo") was sent to reform school when he was a kid for shooting a gun in the air on New Year's Eve. He learned to play the cornet at reform school, but he didn't have a horn of his own, so he wasn't able to play after he was released. However, he listened to bands in jazz clubs, where trumpet player Joe "King" Oliver took Louis under his wing, gave him his first cornet, and gave him trumpet lessons.

Armstrong played in clubs in New Orleans, St. Louis, and finally, playing with Oliver in Chicago, where his amazing playing made him a sensation among other Chicago musicians. He recorded some records for other artists in New York City, including Bessie Smith's classic "St. Louis Blues" in 1925.

He returned to Chicago in 1925 and made his first records under his own name, and his fame began to grow as those recordings were released. He returned in triumph to New Orleans in 1931 and toured Europe and the United States.

In 1938, Armstrong put together a band called Louis Armstrong and his Orchestra, which toured for ten years and was one of the most popular acts in America, making Louis one of the most famous men in America. But as the 1940s came to an end, trends in jazz were changing, and Armstrong's concerts were becoming less popular, so the orchestra was replaced with a small group of soloists, the Louis Armstrong All-Stars, who became extremely popular worldwide.

He had a number-one single in 1963 with his version of "Hello Dolly!", followed a few decades later with another number-one, the infectiously optimistic "What a Wonderful World".

Addendum: avalyn sez: "Allegedly, the July 4, 1900 birthdate he often quoted was conjecture as he didn't actually know his birthdate. His birth certificate shows his date of birth as August 4, 1901. (Or so says the IMDB.)"