In this next article in the series, Erik discusses another fundamental concept in music - the "tone", or what we might musically describe as "pitch".
So, if a vibration moves in a pure pattern of up/down over time, the result is always a sine wave (that roly-poly paradigm of regularity). This sine wave is the purest expression of tone. A sine tone sounds excessively pure. In fact, because it is so rarely found in nature, it is sometimes difficult for us to grasp which pitch the tone is. We are used to dirtier sounds, with multiple layers of sound energy at different pitches and different energy levels.
