Mary Lou Williams

Stride (often called Harlem stride piano) is an early jazz piano style distinguished by a powerful, syncopated left hand that "strides" between low bass notes or octaves on beats 1 and 3 and mid‑range chords on beats 2 and 4, while the right hand plays a highly embellished melody, runs, and improvised variations. Emerging in New York City—especially Harlem—after ragtime, stride expanded the rhythmic looseness, harmonic richness, and improvisational freedom that would feed directly into swing and later jazz piano traditions. It is both virtuosic and danceable, equally suited to fast showpieces and tender ballads, and was central to piano "cutting contests" of the era.