Perfect fifth

Definition and stakes

Portrait of Carl Czerny Carl Czerny,  Letters to a Young Lady (1839)

“ To the diminished octave are to be added the minor third and minor sixth.
You are already acquainted with the nature of the perfect octave, from the perfect common chord. The superfluous octave is a mere passing note, and it may be accompanied by the major third and perfect fifth.
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Source: Wikisource

Portrait of Carl Czerny Carl Czerny,  Letters to a Young Lady (1839)

“ For this reason, intervals are divided into such as are consonant (or agreeable to the ear) , and dissonant (or disagreeable to the ear) .
Consonant intervals are:
(a.) The perfect unison;
(b.) The major and minor third;
(c.) The perfect fifth;
(d.) The major and minor sixth;
(e.) The perfect octave;
(f.) The major and minor tenth.
All others are dissonant.
Consonant intervals are still further divided into perfect and imperfect.
The perfect are: the perfect fifth and perfect octave.
The imperfect are: the major and minor third, and the major and minor sixth.
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Source: Wikisource

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