It's Jelly Roll Morton Day‏

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Jelly Roll Morton, pianist, born September 20, 
1885, in New Orleans. 

Born Ferdinand Joseph LaMothe, he claimed to have
invented jazz in 1902. Whether he did or not, he
was one of jazz's first arrangers.

Listen to this 1926 recording of the Jelly Roll
Blues.

http://www.20sjazz.com/page/803.html