66
(though, however, on the seventh degree it appears with an imperfect fifth), it is nevertheless most important, when placed on the first degree of the key in which we are playing, as it alone can establish and determine the key.
We now come to the second principal chord in thorough-bass; namely, the chord of the minor or dominant seventh.
It consists of a bass note, its major third, perfect fifth, and minor seventh, and consequently of four essential parts; so that it requires no duplication of notes to be in four parts.
It takes place on the fifth degree, or dominant note of every scale; and therefore, in C major or minor, it falls upon G. Ex.
You are already conversant with this chord, from the scale-exercises in my Pianoforte School, where it serves to form the passage or transition from one key to another.
It has the property of requiring a natural,
