Eleventh chord

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Major eleventh chord, Cmaj¹¹.

In music theory, an eleventh chord is a chord that contains the tertian extension of the eleventh. Typically found in jazz, an eleventh chord also usually includes the seventh and ninth, and elements of the basic triad structure. Variants include the dominant eleventh (C¹¹, C–E–G–B♭–D–F), minor eleventh (Cm¹¹, C–E♭–G–B♭–D–F), and major eleventh chord (Cmaj¹¹, C–E–G–B–D–F). Using an augmented eleventh produces the dominant sharp eleventh (C^9♯11, C–E–G–B♭–D–F♯) and major ninth sharp eleventh (Cmaj^9♯11, C–E–G–B–D–F♯) chords.

File:Eleventh chord without third on C.png

Dominant eleventh chord, with the third omitted – "as it appears in actual music" (C¹¹ or C^9sus4).

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Dominant eleventh chord, C¹¹, with the third included. V¹¹ in F major.

A perfect eleventh creates a highly dissonant minor ninth interval with the major third of major and dominant chords. To reduce this dissonance the third is often omitted (such as for example in the dominant eleventh chord that can be heard 52 seconds into the song "Sun King" on The Beatles' Abbey Road album), turning the chord into a suspended ninth chord (e.g. C^9sus4, C–G–B♭–D–F), which can be also notated as Gm⁷/C.

Another solution to this dissonance is altering the third or eleventh factor of the chord to turn the problematic minor ninth interval within the chord into a major ninth. A dominant eleventh chord can be altered by lowering the third by a semitone for a minor eleventh chord, or by raising the eleventh by a semitone for a dominant sharp eleventh chord, implying the lydian dominant mode.

As its upper extensions (7th, 9th, 11th) constitute a triad, a dominant eleventh chord with the third and fifth omitted can be notated as a compound chord with a bass note. So C–B♭–D–F is written as B♭/C, emphasizing the ambiguous dominant/subdominant character of this voicing.

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Voice leading for dominant eleventh chords in the common practice period.

In the common practice period, the root, 7th, 9th, and 11th are the most common factors present in the V¹¹ chord, with the 3rd and 5th typically omitted. The eleventh is usually retained as a common tone when the chord resolves to I or i.

Relation to suspended fourth chord

Main article: Suspended chord

File:Fourth of a suspended fourth chord on C.png

Fourth factor (F), in red, of a C suspended fourth chord, C^sus4 ().

The fourth degree is octave equivalent to the eleventh. The dominant eleventh chord could be alternatively notated as the very unorthodox ninth added fourth chord (C^9add4), from where omitting the 3rd produces the more common ninth suspended fourth chord (C^9sus4, also known as the jazz sus chord).

See also

• Elektra chord
• Jazz chord
• Bridge chord