Just like chords, scale formulas can be transcribed using the number of semitones between the notes of a scale. As can be seen above the Suspended Pentatonic = 2 3 2 3 2. Using numbers to describe scale formulas is useful because the sum of the numbers will always add to twelve. This is true of chord formulas as well. Because of the simplicity, this book uses numbers to describe the formulas of chords and scales in lieu of the two previously described methods. |