What style of jazz did Louis Armstrong popularize in the 1920s?

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Louis Armstrong, often nicknamed "Satchmo" or "Pops," is one of the most iconic figures in jazz. Originally from New Orleans, he played a crucial role in popularizing the Dixieland style, also known as traditional jazz or New Orleans jazz. Armstrong transformed jazz from ensemble music into an art form focused on the soloist, thanks to his incredible trumpet technique and unique vocal style, characterized by his innovative scat singing. His 1920s recordings with his groups, the Hot Five and the Hot Seven, are among the most influential in jazz history, establishing the foundations of jazz as a major form of artistic expression.