Renato Dionisi (1910–2000) was an influential Italian composer, teacher, and writer. He taught harmony at several major conservatories, including Milan, where his students included the renowned singer-songwriter Franco Battiato.
You can purchase a physical copy online from major Italian bookstores (like Libreria Zanetti, Libreria Lucca Sapiens, or Libreria Fernandez) or directly from the publisher, Edizioni Curci. Check their websites for availability. Libreria Lucca Sapiens
Lezioni di Armonia Complementare by Renato Dionisi is a cornerstone text for music students in Italy, particularly those studying in Conservatories. Often sought in digital formats (PDF), this manual provides a structured, direct approach to harmonic studies, focusing on the essential rules needed for a solid musical foundation. Overview of Dionisi's "Lezioni di Armonia Complementare" this manual provides a structured