vol. 1. The didactic duo : an overview -- The early duo -- Different kinds of duo -- Duos as compositions and as teaching materials -- v. 2. Appendices -- v. 3. Music appendix.
Note
Vol. 2 (453 p.) appendices include bibliographic information and musical incipits for "all the Italian source of duos." Vol. 3 (239 p.) contains selected complete duos and facsimiles.