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Leon Bismark Beiderbecke, known as Bix Beiderbecke, was an American jazz cornetist, pianist, and composer. He was a prominent figure in the development of jazz in the 1920s and is considered one of the most influential jazz musicians of all time. Beiderbecke's unique playing style, characterized by its lyrical melodies and improvisational brilliance, has had a lasting impact on jazz music.