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Watch the Major Scale Slash Chords online guitar lesson by Brad Carlton from Guitar Lab: Slash Chord Science

This lesson focuses on the diatonic triads in the key of C. Appendix A is a comprehensive chart which reveals the intervallic construction of 21 scales and modes commonly used in modern music. Appendix B is a chart of the 15 major scales which encompass the keys we deal with as musicians. This chart reveals the seven diatonic modes as well as the diatonic triads and seventh chords that are built off each scale degree. We are going to stay in the key of C for this entire workout and the chords are as follows: C is the I chord, Dm is the ii chord, Em is the iii chord, F is the IV chord, G is the V chord, Am is the vi chord, and Bdim is the vii chord. Appendix C shows all 49 possibilities of the seven diatonic triads over the seven possible bass notes in the key of C.

Diagram 1A shows the key of C over the entire fingerboard. Diagram 1B shows the one note per string arpeggios for the diatonic triads in the key of C. They are color-coded starting with the C triad and moving up through all seven chords. These will be referred to as second inversion chord voicings because the fifth of the chord is the lowest tone. Diagram 1C shows root position voicings starting with the A minor chord. These have the root of the chord as the lowest tone. Diagram 1D shows the first inversion voicings starting with the F chord. These have the third of the chord as lowest tone.