Stride pianists are musicians who play a style of jazz piano characterized by a strong, rhythmic left hand that alternates between bass notes and chords, while the right hand plays melodies and improvisations. This technique creates a lively and dynamic sound, making stride piano a popular choice in jazz clubs and dance halls during the early 20th century. Notable stride pianists include Fats Waller, James P. Johnson, and Willie "The Lion" Smith. They helped to develop this style, which combines elements of ragtime and jazz, influencing many future generations of pianists and contributing to the evolution of jazz music.