Perfect fourth: Difference between revisions
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The '''perfect fourth''' is the octave complement of the [[perfect fifth]]. It generally has a frequency ratio of '''4/3''', and is 498.0 cents in size when justly tuned. | The '''perfect fourth''' is the octave complement of the [[perfect fifth]]. It generally has a frequency ratio of '''4/3''', and is 498.0 cents in size when justly tuned. | ||
While it has a relatively simple ratio (and can thus be used as a consonance especially in Pythagorean theory or as a harmonic interval), in classical theory, the perfect fourth above the root is often treated as a dissonance to resolve down to the major third. | While it has a relatively simple ratio (and can thus be used as a consonance especially in Pythagorean theory or as a harmonic interval), in classical theory<sup>[which classical theory?]</sup>, the perfect fourth above the root is often treated as a dissonance to resolve down to the major third. | ||
Latest revision as of 06:40, 12 April 2026
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The perfect fourth is the octave complement of the perfect fifth. It generally has a frequency ratio of 4/3, and is 498.0 cents in size when justly tuned.
While it has a relatively simple ratio (and can thus be used as a consonance especially in Pythagorean theory or as a harmonic interval), in classical theory[which classical theory?], the perfect fourth above the root is often treated as a dissonance to resolve down to the major third.
