Which chord is described as a diminished triad plus a diminished seventh?

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Multiple Choice

Which chord is described as a diminished triad plus a diminished seventh?

A fully diminished seventh chord is formed by adding a diminished seventh above the root to a diminished triad. This creates a four-note chord where each successive interval is a minor third, giving a symmetrical, tense sound. The description “diminished triad plus a diminished seventh” matches exactly this four-note sonority, and the conventional name for it is a diminished seventh chord (often called fully diminished seventh to emphasize its complete four-note structure). This distinguishes it from a half-diminished seventh, which uses a minor seventh instead of a diminished seventh, and from a dominant seventh, which uses a major triad with a minor seventh.

A fully diminished seventh chord is formed by adding a diminished seventh above the root to a diminished triad. This creates a four-note chord where each successive interval is a minor third, giving a symmetrical, tense sound. The description “diminished triad plus a diminished seventh” matches exactly this four-note sonority, and the conventional name for it is a diminished seventh chord (often called fully diminished seventh to emphasize its complete four-note structure). This distinguishes it from a half-diminished seventh, which uses a minor seventh instead of a diminished seventh, and from a dominant seventh, which uses a major triad with a minor seventh.

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