When did Harlem stride piano style originate?

Harlem stride piano style originated in the early 20th century, primarily during the 1920s in Harlem, New York City. It evolved from earlier ragtime music and was characterized by its rhythmic complexity and improvisational flair. Key figures like Fats Waller and James P. Johnson were instrumental in popularizing this style, which blended elements of jazz and Classical Music. Stride piano became a defining element of the jazz genre and influenced many subsequent musicians.