: Dionisi defines a traditional chord as a superposition of three or more sounds ordered by thirds, a definition rooted in the physical-harmonic phenomenon.
Dionisi grades chords on a scale from 0 (pure octave) to 10 (altered dominant with all tensions). A Cmaj7 has a low tension (2). A C7#9b13 has a tension of 9. You learn to move smoothly between tension levels. Lezioni Di Armonia Complementare Dionisi Pdf
It’s famous for being incredibly concise (only ~78 pages!) but somehow covering everything you actually need to know without the fluff. It’s basically the "cheat sheet" version of a harmony manual. Where to find it: Official Copy: You can grab the physical Edizioni Curci version on Amazon.it for about €12-€13. Digital Access: : Dionisi defines a traditional chord as a
If you want a list of that pair with this book A C7#9b13 has a tension of 9
The "Dionisi Pdf" refers to the digital version of the book, which has been made available online in PDF format. This has enabled music students and enthusiasts from around the world to access and study Dionisi's work, gaining a deeper understanding of harmonic theory and its applications.
: Understanding the physical and harmonic phenomena behind stable and unstable intervals.
Here are a few options for your post, ranging from a practical student-to-student style to a more formal "essential resources" recommendation.