Dewey Square is a bebop composition by Charlie Parker, written as a contrafact on the chord changes of George Gershwin's Oh, Lady Be Good! Parker's new melody transforms the bright Broadway standard into a harmonically sophisticated bebop vehicle, layering chromatic complexity and rhythmic drive over the familiar progression. The tune features structural syncopation at middleground levels, where foreground misalignments between the fundamental melodic line and bass support realign at deeper structural levels, alongside harmonic devices such as tritone substitution and modal mixture. These elements give it an intricate, fast-paced character suited to virtuosic playing. The original recording was made in 1948 by the Charlie Parker Quintet featuring Miles Davis on trumpet, Duke Jordan on piano, Tommy Potter on bass, and Max Roach on drums, and was issued as a 78 RPM single. Dewey Square holds a place in Parker's canon alongside compositions like Confirmation, Moose the Mooch, and Yardbird Suite, all of which have been analyzed for shared structural phenomena that advanced jazz harmony and form. It has been frequently transcribed and arranged for performance and study, appearing in educational sheet music and lead sheet collections. A notable later arrangement by Med Flory features a harmonized transcription of Parker's original solo. While not as ubiquitous as Ornithology or Confirmation, Dewey Square is recognized as a significant bebop standard that exemplifies Parker's pioneering approach to recomposing over existing harmonic frameworks.