Practical musical theory: Triad

From Wikipedia, which is a working definition in many textbooks.  


In music, a triad is a set of three notes (or "pitches") that can be stacked vertically in thirds.[1] The term "harmonic triad" was coined by Johannes Lippius in his Synopsis musicae novae (1612).
When stacked in thirds, notes produce triadic chords. The triad's members, from lowest-pitched tone to highest, are called:[1]
(Note: The notes of a triad do not have to use the root as the lowest note of the chord, due to the principle of inversion. A triad can also use the third or fifth as the lowest note of the chord. Inverting a chord does not change the root note.)

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