Ninth
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Hyacinth
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In [[music]] or [[music theory]] a '''ninth''' is the [[note]] nine [[scale degree]]s from the [[root (chord)|root]] of [[chord (music)|chord]] (counting the root itself) and also the [[interval (music)|interval]] between the root and the ninth.
In tonal music of common practice, the interval of a ninth is heard as a [[Consonance and dissonance#Dissonance|dissonance]]. A ninth is a [[compound interval|compound]] second, but the ninth is considered less dissonant than the [[Major second|second]].
[[Image:ninth_chord.gif|right|frame|Ninth chord]]
A '''ninth chord''' or '''dominant ninth''' is a [[chord (music)|chord]] or [[dominant (music)|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 {{Audio|Maj ninth chord on C.mid|play}}. 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 {{Audio|Dominant ninth chord on C.mid|play}}.
[[Added tone chord]]s with what might be called an added second are usually said to have an added ninth, two [[Perfect fifth|fifth]]s 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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