Watch the Diatonic 3-Note Chords online guitar lesson by Stu Hamm from Stu Hamm U: Fretboard Fitness

Now that you have learned the different fingerings for 7th chords, here is an exercise that once again takes up the C major scale, playing chords using the root, 3rd and 7th tones from each of the modes that are created by starting on the different notes of the scale. These fingerings should start to be very familiar by now, and you should start to really understand where they come from.