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List of fifth intervals : ウィキペディア英語版 | List of fifth intervals In the theory and practice of music, a fifth interval is an ordered pair of notes that are separated by 6–8 semitones. There are three types of fifth intervals, namely * ''perfect'' fifths (7 semitones), * ''diminished'' fifth (6 semitones), and * augmented fifth (8 semitones). After the unison and octave intervals, the ''perfect fifth'' is the most important interval in tonal harmony. It is highly consonant. Its implementation in equal temperament tuning is highly accurate, unlike the major third interval, for example. As explained below, it is used to generate the chromatic circle and the cycle of fifths, and it is used for tuning string-instruments. It is a constituent interval for the fundamental chords of tonal harmony. ==Tonal harmony== The fundamental chords of tonal music—major and minor triads and also seventh chords—all contain fifth intervals. *''Perfect'' fifths are contained in major and minor triads and in particular seventh chords (especially major-minor sevenths with dominant function, major sevenths, and minor sevenths). *''Diminished'' fifths are contained in diminished triads and in half-diminished sevenths and fully diminished seventh chords. Fifths are stacked to form chords in quintal harmony.
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