Eleventh
Encyclopedia : E : EL : ELE : Eleventh
In music or music theory an eleventh is the note eleven scale degrees from the root of a chord and also the interval between the root and the eleventh.
Since there are only seven degrees in a diatonic scale the eleventh degree is the same as the subdominant and the interval of an eleventh is a compound fourth.
An eleventh chord is a chord which contains an eleventh. Typically, an eleventh chord also includes the seventh and ninth along with the basic triad structure. Since the diatonic eleventh (for example the F on the C11 chord shown at right) would create a dissonant minor ninth interval with the third of the chord (the E), the 11th and 3rd rarely appear together. Instead, the chordal third is omitted when the F is present and the chord becomes a suspended chord (sus4 chord).
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