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A pioneer of stride piano , he was one of the most important pianists in the early era of recording , and like Jelly Roll Morton , one of the key figures in the evolution of ragtime into what was eventually called jazz .
 Jelly Roll Morton
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jelly Roll Morton