Jazz Inventions for Keyboard - 50 Etudes that will Improve the way you play jazz. Pianists all know the benefits of playing t he Two-Part Inventions of Bach. Now world-respected jazz pianist & composer Bill Cunliffe has written his own "inventions" t hat will benefit every player's understanding & performance of jazz. These great-sounding etudes explore the specific harmoni c melodic & technical challenges faced by jazz keyboardists including the ii-V & ii-V-I progressions etc.