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Basic Chord Forms and Voice Leading
All of the chords shown so far for the D7 are root 5 chords. One way to put more interest in root 5 7th chords is to not play the root of the chord as the bottom note, but to use the b7th (in this case, C). The bottom two notes of your chord are now the 3rd and b7th, which forms a solid base upon which to include other notes. Using this principle, we get D7 voicings like the following...