Ramsay
And as the notes of this family are born of one fundamental note, so the chords into which they are grouped are like so many younger families. The fundamental note is the common root of three chords, each of which is a little family of notes having its own generating root; although the top of the first is the root of the second, and the top of the second, the root of the third. This also is illustrated in the Genesis of the Scale. [Scientific Basis and Build of Music, page 20]

See Also

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chord
dominant
dominant chord
subdominant
subdominant chord
tonic
tonic chord