Arthur Tatum Jr. was an American jazz pianist who is widely regarded as one of the greatest ever. From early in his career, fellow musicians acclaimed Tatum's technical ability as extraordinary. Tatum also extended jazz piano's vocabulary and boundaries far beyond his initial stride influences, and established new ground through innovative use of reharmonization, voicing, and bitonality.

Stride jazz piano, often shortened to stride, is a jazz piano style that arose from ragtime players. Prominent stride pianists include James P. Johnson, Willie "the Lion" Smith, Fats Waller, Luckey Roberts, and Mary Lou Williams.