Eleventh

In music theory, an eleventh is a compound interval consisting of an octave plus a fourth.

A perfect eleventh spans 17 and the augmented eleventh 18 semitones, or 10 steps in a diatonic scale.

[1] The eleventh is considered highly dissonant with the major third.

In common practice tonality, it usually had subdominant function as minor eleventh chord on the second degree (supertonic) of the major scale.

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