Why a rating treaty?
Because our study on US encryption is the only one that, to date, is as complete and constitutes a real agreement rating treaty.
In the first part of the book, we will develop throughout this treatise on the American enumeration the study of possible or impossible tensions, that is to say all the degrees added or not to the basic perfect chord.
The prohibitions to place "bad" tensions are not the result of a whim but depend on acoustic laws - see our table of harmonics - and in case of error, the agreement will sound in the worst case "pasty" and at worst, it will severely scratch our ears.
We will choose our examples in major, minor and diminished agreements. We will list in tables, all possible or impossible tensions.
Another table will allow us to establish a correspondence between the US and classic encryption.
The study would not be complete if we did not propose to you to practice. Thus, in the second part of book, we will offer you to perform exercises. Be careful, there will be some traps to outwit!
And to be perfectly serene, at the end of the third part of this book, we will give you the solutions with the corrected exercises.