The natural pure sounds that are a part of any musical tone; the overtones that are present with any fundamentaltone. That is, the series of sounds heard when any note is sounded, consisting of the original note, which is the fundamental or first harmonic, then the tone an octave above that called the first overtone (also called the second harmonic), then the fifth above the first overtone, then the perfectfourth above that, then the majorthird above that, etc., in increasingly smaller intervals.