The Ninth reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Ninth

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.

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. 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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