What are 7th 9th and 11th chords?
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Similarly, you may ask, what is the 11th of a chord?
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, minor eleventh, and the major eleventh chord.
Likewise, what does add 11 mean? "Add" is only used when a note is added to a standard chord structure. (e.g. D9 add#11.) Suspended is only used to describe when 4 is in place of 3. No other note can be suspended. 11th is a note that is an extension of the chord octave in sonority, but not necessarily in the voicing.
Accordingly, how do you find the 9th of a chord?
In order to make a major 9 chord just stack another minor third on top of the B, or 7th, of the chord. A minor third away from B is D. D would be the major 9th of C. Just tag that note on to the C major 7th chord to get your C major 9 chord.
How do you use 11th chords?
#11 chords are often used to spice up Tonic chords (I) and Sub-Dominant chords (IV). This is a very "off balance" sound, and comes up in jazz a good bit. A C#11 chord could be voiced as a D with a C bass, or D/C.