During his life, Scott Joplin said that people would not appreciate his music until 50 years after his death. And he wasn’t wrong, though now he’s often called the king of ragtime writers.
Research:

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Vadukul, Alex. “The Forgotten Entertainer Rag.” New York Times. 5/24/2018. https://www.nytimes.com/2018/05/24/nyregion/remembering-scott-joplin.html See omnystudio.com/listener for privacy information.