"I Got Rhythm Changes" refers to a popular chord progression derived from the song "I Got Rhythm" by George Gershwin. This progression typically follows a pattern of eight bars, primarily using major chords, and has become a foundational element in jazz music. Musicians often use these changes as a basis for improvisation and composition. The rhythm changes are characterized by their upbeat tempo and lively feel, making them a favorite among jazz musicians. Many well-known jazz standards, such as "Oleo" by Sonny Rollins and "Anthropology" by Charlie Parker, are built upon this chord structure, showcasing its versatility and enduring appeal in the genre.