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7th
chords
A 7th chord is
a four-note chord built in thirds. Following are the 7th chords
built on the white keys of the piano:

Every 7th chord consists of
four components: a root, a third,
a fifth and
a seventh.
As with the triads, the root is the tone from which the chord is
both constructed and named. The following chord, therefore, is a
C seventh chord.

  
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