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In music or music theory a ninth is the note nine scale degrees from the root of chord and also the interval between the root and the ninth.
In tonal music of common practice, the ninth is heard as a dissonance. A ninth is a compound second, but the ninth is considered less dissonant than the second.
A ninth chord is a chord with a ninth, and is an extended chord. Typically, a ninth chord also includes the seventh along with the basic triad structure. Added tone chords with what might be called an added second are usually said to have an added ninth, two fifths up from the root.
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