In classical music from Western culture, a diminished seventh () is an interval produced by narrowing a minor seventh by a chromatic semitone, and its inversion is the augmented second. For instance, the interval from A to G is a minor seventh, ten semitones wide, and both the intervals from A♯ to G, and from A to G♭ are diminished sevenths, spanning nine semitones.
In classical music from Western culture, a diminished seventh () is an interval produced by narrowing a minor seventh by a chromatic semitone, and its inversion is the augmented second. For instance, the interval from A to G is a minor seventh, ten semitones wide, and both the intervals from A♯ to G, and from A to G♭ are diminished sevenths, spanning nine semitones.
Source: Wikipedia "Diminished seventh" · CC BY-SA 4.0
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