explicitly generalizes the relationship between the Harmonic series and Just intonation to embrace pseudo-harmonic timbres played in related pseudo-just tunings. As a result, Dynamic Tonality enables any musical interval to be made more or less consonant or dissonant in real time (i.e., during composition and/or performance) by controlling the degree to which the partials of the pseudo-harmonic timbre align with the interval's notes in the related pseudo-just tuning. For example, listen to C2ShiningC, which uses a timbre progression and a tuning progression to make the intervals within a single chord more or less consonant. Music theory Consonances may include: Perfect consonances: unisons and octaves perfect fourths and perfect fifths Imperfect consonances: major seconds and minor sevenths major thirds and minor sixths minor thirds and major sixths Dissonances may include: Perfect dissonances: tritones minor seconds and major sevenths Physiological basis Two notes played simultaneously but with slightly different frequencies produce a beating "wah-wah-wah" sound. This phenomenon is used to create the Voix céleste stop in organs. Other musical styles such as Bosnian ganga singing, pieces exploring the buzzing sound of the Indian tambura drone, stylized improvisations on the Middle Eastern mijwiz, or Indonesian gamelan consider this sound an attractive part of the musical timbre and go to great lengths to create instruments that produce this slight "roughness". Sensory dissonance and its two perceptual manifestations (beating and roughness) are both closely related to a sound signal's amplitude fluctuations. Amplitude fluctuations describe variations in the maximum value (amplitude) of sound signals relative to a reference point and are the result of wave interference. The interference principle states that the combined amplitude of two or more vibrations (waves) at any given time may be larger (constructive interference) or smaller (destructive interference) than the amplitude of the individual vibrations (waves), depending on their phase relationship. In the case of two or more waves with different frequencies, their periodically changing phase relationship results in periodic alterations between constructive and destructive interference, giving rise to the phenomenon of amplitude fluctuations. "Amplitude fluctuations can be placed in three overlapping perceptual categories related to the rate of fluctuation. Slow amplitude fluctuations (≈≤20 per second) are perceived as loudness fluctuations referred to as beating. As the rate of fluctuation is increased, the loudness appears constant, and the fluctuations are perceived as "fluttering" or roughness. As the amplitude fluctuation rate is increased further, the roughness reaches a maximum strength and then