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Ordinary modulations in the minor keys with their relative majors.
A circuit of all the major keys performed by the aid of the dominant seventh.
As there are twelve semitones within the octave, and any one of these may be taken as the basis of a key, and as every key may be formed to be either major or minor, there are consequently not less than twenty-four keys, into which, in modulating, we may occasionally move. Twelve of these transitions are adroitly performed by the agency of the diminished seventh.