To find a triad’s quality, identify the diatonic interval between the root and the other members of the chord. The fifth of the chord is the pitch class that is a fifth higher than the root. The third of the chord is the pitch class that is a third higher than the root. Once you know the root, you can identify the other notes as the third of the chord (a third above the root) and the fifth of the chord (a fifth above the root). Expressed another way, if the circle ascends by thirds as it moves clockwise, the root is the “earliest” note (thinking like a literal clock), and the other pitch classes come “later.” When you arrange the pitch classes on the circle of thirds, the root is the lowest pitch-class of the three-pitch-class clump. To find a triad’s root, arrange the pitch classes on a circle of thirds (mentally or on paper). Triads are identified according to their root and quality. (There are a few exceptions to this rule, but they rarely appear in Western music, so don’t worry about them for now.)Ī circle of thirds makes things even clearer, as the pitch classes of a triad will always sit next to each other. If the three pitch classes are distributed as above, with two intervals skipping one pitch class and with one interval skipping two pitch classes, the chord is a triad. (By generic, I mean that A-natural, A-flat, and A-sharp are all kinds of A.) Assuming there are three pitch classes (not necessarily three pitches), arrange them on the circle of generic scale steps. To tell whether or not a chord is a triad, take the pitch classes present in the chord. A chord is any combination of three or more pitch classes that sound simultaneously.Ī three-note chord whose pitch classes can be arranged as thirds is called a triad.
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