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Watch the C Dominant 7 Chord Inversions online guitar lesson by Frank Vignola from Inversion Excursion

Now that you have a good grasp on the triads let's move on to adding extensions. We will be adding the flatted 7th to the triad to make a C dominant 7th chord. Remember: a triad is a three note chord consisting of the 1st, 3rd and 5th step of the applicable scale. In this case C, E and G spell the C major triad. Adding an extension to the triad creates a 4 note chord. In this case we are adding the flatted 7th step of the scale to the C major triad. The 7th step of the C scale is Bb or the flatted 7th. So the spelling of a C dominant 7th chord is: C-E-G-Bb or 1-3-5-b7. Let's start inverting. In this case, when playing the Bb in the bass is considered the 3rd inversion. Root position has root in the bass, 1st inversion has the 3rd in the bass, 2nd inversion has the 5th in the bass and the 3rd inversion has the extension or in this case the 7th in the bass. For each inversion, look at the chord and pick out each of the chord tones naming the notes.