Other Qualities of Fifth
In addition to perfect, there are two other kinds, or qualities, of fifths: the diminished fifth, which is one chromatic semitone smaller, and the augmented fifth, which is one chromatic semitone larger. In terms of semitones, these are equivalent to the tritone (or augmented fourth), and the minor sixth, respectively.
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“Pedants make a great rout about criticism, as if it were a science of great depth, and required much pains and knowledge—criticism however is only the result of good sense, taste and judgment—three qualities that indeed seldom are found together, and extremely seldom in a pedant, which most critics are.”
—Horace Walpole (1717–1797)