DUETS by David Baker. These duets were designed to be fun to play and listen to, but more than that, they are challenging and full of musical problems similar to what one would face in professional playing situations. Complete with performance suggestions and notes to the rhythm section, this book is extremely useful for developing a number of skills and facilities. These books can be use by ANY two instruments in the same key (not just C instruments). Available in bass or treble clef editions.