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- In classical music from Western culture, a diminished fourth is an interval produced by narrowing a perfect fourth by a chromatic semitone. For example, the interval from C to F is a perfect fourth, five semitones wide, and both the intervals from C♯ to F, and from C to F♭ are diminished fourths, spanning four semitones. Being diminished, it is considered a dissonant interval. A diminished fourth is enharmonically equivalent to a major third; that is, it spans the same number of semitones, and they are physically the same pitch in twelve-tone equal temperament. For example, B–D♯ is a major third; but if the same pitches are spelled B and E♭, as occurs in the C harmonic minor scale, the interval is instead a diminished fourth. In other tunings, however, they are not necessarily identical. For example, in 31 equal temperament the diminished fourth is slightly wider than a major third, and is instead the same width as the septimal major third. The Pythagorean diminished fourth (F♭--, 8192:6561 = 384.36 cents), also known as the schismatic major third, is closer to the just major third than the Pythagorean major third. The 32:25 just diminished fourth arises in the C harmonic minor scale between B and E♭. (en)
- En musique, une quarte diminuée est un intervalle de quatre demi-tons. Elle est formée à partir d'une quarte juste diminuée d'un demi-ton chromatique. Dans un tempérament égal à douze demi-tons (gamme tempérée), elle est l'équivalent enharmonique de la tierce majeure. (fr)
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| rdfs:comment
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- En musique, une quarte diminuée est un intervalle de quatre demi-tons. Elle est formée à partir d'une quarte juste diminuée d'un demi-ton chromatique. Dans un tempérament égal à douze demi-tons (gamme tempérée), elle est l'équivalent enharmonique de la tierce majeure. (fr)
- In classical music from Western culture, a diminished fourth is an interval produced by narrowing a perfect fourth by a chromatic semitone. For example, the interval from C to F is a perfect fourth, five semitones wide, and both the intervals from C♯ to F, and from C to F♭ are diminished fourths, spanning four semitones. Being diminished, it is considered a dissonant interval. The 32:25 just diminished fourth arises in the C harmonic minor scale between B and E♭. (en)
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