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 or dominant ninth is a chord or dominant chord with a ninth, and as an extended chord typically includes the seventh along with the basic triad structure. Thus, a Cmaj9 consists of C E G B and D . When the symbol "9" is not preceded by the word "major" or "maj", the implied seventh is a minor seventh -- e.g. a C9 consists of C E G Bb 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.
The Minor Ninth chord is played with a flattened third and 7th the formula is 1, b3, 5, b7, 9. This chord is wrote as Cm9. This chord has a more "bluesy" sound and fits very well with the dominant 9th.
See also
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Last updated on Sunday September 14, 2008 at 03:23:05 PDT (GMT -0700)
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