| 9th, 11th, 13th Chords |
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| Music Theory Music Theory IV | |
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Description
You've studied triads, seventh chords. But what of beyond seventh chords? That territory is of 9th, 11th and 13th chords. These are called extensions, as they go beyond an octave within a chord. Beyond an octave you have the following:
9th (equivalent of a 2nd) In a triad you have already two of those, the 10th = the 3rd, the 12th = the 5th. So the use of these isn't an extension. But adding the remaining three do result in extension chords. Remember the following:
Ninth Chords Ninth chords are created by adding a major ninth to an existing seventh chord, whatever quality it has. Eleventh Chords Eleventh chords are created by adding a perfect eleventh interval to an existing ninth chord. There are some exceptions. If you have a major 9th chord or a dominant chord, and you add a perfect 11th, you will create a very dissonant chord. To decrease the dissonance raise the 11th by a half-step. You reflect this alteration in the chord name like so. If you have a minor ninth or a flatted 5th chord, then the perfect 11th is not dissonant against the minor third. So you can leave it alone. Here are some rules to show you how it works:
Now if you have an 11th added without a 9th, then you actually have a "suspended chord." Thirteenth Chords Thirteenth chords that are "complete" are built by adding a major thirteenth to an existing eleventh chord. You should note that extended chords won't always have ALL of the notes that it theoretically should have. In a thirteenth chord it is popular to leave out the eleventh. If the eleventh is in the chord and it is altered you must show that is. User reviews There are no user reviews for this item. Add new review Copyright 2006. All Rights Reserved. |
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