Ninth

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In music or music theory a ninth is the note nine scale degrees from the root of chord (counting the root itself) and also the interval between the root and the ninth.

In tonal music of common practice, the interval of a 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 as an extended chord typically includes the seventh along with the basic triad structure. Thus, a C9 consists of C E G B and D. 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.

The Hendrix chord uses a sharpened ninth. This is, enharmonically, the flatted third, and is tonally ambiguous or bitonal.

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Last updated on Thursday March 06, 2008 at 03:28:06 PST (GMT -0800)
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