Innovations in postbop jazz compositions of the 1960s occurred in several dimensions, including harmony, form, and melody. Postbop jazz composers such as Wayne Shorter, Herbie Hancock, and Chick Corea broke with earlier tonal jazz traditions. Their compositions marked a departure from the techniques of jazz standards and original compositions that defined small-group repertory through the 1950s: single-key orientation, schematic 32-bar frameworks...