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Building Dominant 7 Chords
You may wish to review Building
Major & Minor Chords before proceeding with this lesson
Dominant 7 chords are essentially a Major triad with a minor 7th added as
extended harmony.
Once you've established a major triad, there are a couple ways to figure the
7th; you could either find the seventh a step and a half above the fifth or a
whole step below the root (the root being also the eighth).
Here are a few examples:
G Major: root - G, third - B, fifth - D
A step and a half up from D (fifth) is F. Likewise, a whole step down from G is
F
So G7 is spelled G, B, D, F
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C Major: root - C, third - E, fifth - G
A step and a half up from G (fifth) is Bb. Likewise, a whole step down from C is
Bb
So C7 is spelled C, E, G, Bb*
*The seventh must be called Bb and not A# (which is enharmonic or exactly the
same pitch) because A# would be a sixth
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F Major: root - F, third - A, fifth - C
A step and a half up from C (fifth) is Eb. Likewise, a whole step down from F is
Eb
So F7 is spelled F, A, C, Eb*
*Again, the seventh must be called Eb and not D# (which is enharmonic or exactly
the same pitch) because D# would be a sixth
Contact
the studio of Thomas Coffey at 813.961.9167 or guitarteacher@tampabay.rr.com
Copyright © 2008 by Thomas Coffey. All Rights Reserved.
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