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why is scott joplin considered the king of ragtime? (i do not need biography)
in other words, what proof is there that proves scott joplin is the king of ragtime.

Scott Joplin was the one who introduced the piano works in the style known as Ragtime that flourished along the Mississippi River in the late 19th century and endured as a prominent piano style until the end of World War I. An article in the Sedalia Times recognized him as "The Rag Time King" and it was written that his work is used by the leading players and orchestras.