Chapter 2 begins with an overview of Parker’s fully composed 32-bar rhythm changes compositions. Parker is strongly associated with improvising on rhythm changes (the chord changes of “I Got Rhythm,” by George and Ira Gershwin), but there are only six such pieces, and they are all in B♭ major: “Red Cross,” “Shaw ’Nuff,” (co-composed with Dizzy Gillespie), “Moose the Mooche,” “Thrivin’ from a Riff,” “Dexterity,” and “Passport.” This allows for convenient comparison among them. Among the various conclusions, the analyses show that despite being contrafacts on rhythm changes—all in the same key and using straightforward bebop harmony—these pieces are satisfyingly different.