Why Do An Interval & Its Inversion Add up To 9 Instead of 8?

Why Do An Interval & Its Inversion Add up To 9 Instead of 8? Here’s something you may have wondered at some point in your musical studies or career: If there are only eight diatonic notes in an octave, why is it that when you invert any interval, the starting interval plus its inversion always … Continue reading Why Do An Interval & Its Inversion Add up To 9 Instead of 8?