In Western tonal music theory, an augmented octave is the sum of a perfect octave and an augmented unison or chromatic semitone. It is the interval between two notes, with the same note letter on staff positions an octave apart, whose alterations cause them, in ordinary equal temperament, to be thirteen semitones apart. In other words, it is a perfect octave which has been widened by a half-step, such as B♭ and B♮ or C and C♯; it is a compound augmented unison. It is the enharmonic equivalent of a minor ninth.
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| - Augmented octave (en)
- Octave augmentée (fr)
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| - In Western tonal music theory, an augmented octave is the sum of a perfect octave and an augmented unison or chromatic semitone. It is the interval between two notes, with the same note letter on staff positions an octave apart, whose alterations cause them, in ordinary equal temperament, to be thirteen semitones apart. In other words, it is a perfect octave which has been widened by a half-step, such as B♭ and B♮ or C and C♯; it is a compound augmented unison. It is the enharmonic equivalent of a minor ninth. (en)
- En musique, une octave augmentée est une octave augmentée d'un demi-ton chromatique, soit un intervalle de six tons et demi (treize demi-tons). Dans un tempérament égal à douze demi-tons (gamme tempérée), l'octave diminuée est l'équivalent enharmonique de la neuvième mineure. (fr)
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| - In Western tonal music theory, an augmented octave is the sum of a perfect octave and an augmented unison or chromatic semitone. It is the interval between two notes, with the same note letter on staff positions an octave apart, whose alterations cause them, in ordinary equal temperament, to be thirteen semitones apart. In other words, it is a perfect octave which has been widened by a half-step, such as B♭ and B♮ or C and C♯; it is a compound augmented unison. It is the enharmonic equivalent of a minor ninth. (en)
- En musique, une octave augmentée est une octave augmentée d'un demi-ton chromatique, soit un intervalle de six tons et demi (treize demi-tons). Dans un tempérament égal à douze demi-tons (gamme tempérée), l'octave diminuée est l'équivalent enharmonique de la neuvième mineure. (fr)
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| - see "Augmented unison" (en)
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