Lewis may be best known for successfully crossing over from the Jazz charts to the Pop charts with his smash hit "The In Crowd."
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Lewis played with a soulful elegance that transcended genre, blending pop and jazz into something uniquely his.
"The man just oozed charm as he was performing and really engaged his audiences," said Christine Taylor Conda, Ravinia Festival's director of education programs.
Lewis was born in Chicago in 1935 and grew up in the Cabrini Green housing project. He began playing piano when he was only 4.
"Used to walk by The London House at Wacker and Michigan every day on his way to his classical piano lessons," recalled David Marienthal, executive producer of the 2021 documentary "Live at Mister Kelly's."
Lewis played in Mister Kelly's house band, opening for some of the world's biggest acts before achieving his own stardom with "The In Crowd," "Hang On Sloopy" and other hits.
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He was also a lifelong supporter of arts education, and helped found the Ravinia Jazz Mentor Program, which has helped thousands of CPS students pursue a future in music.
"He knew that underrepresented kids in underserved areas would not have the access that they needed," Conda said.
In 2014 Lewis told ABC7 he'd like to be remembered "as a wonderful human being, hopefully, that happened to play piano."
Lewis recorded more than 80 album. He is survived by his wife, five children, and several grandchildren and great-grandchildren. And he continued playing until the very end; an album of his livestream performances is due to be released in November.