Watch the Learning and Practicing Triad Inversions online guitar lesson by Frank Vignola from Modern Method for Guitar
Now it is up to you to apply the same concepts we used to study the major scale to the study of harmonizing the major scales with triads.
1. Start with the notes of the C major scale C-D-E-F-G-A-B; build a chord on each step of the scale using only the notes of the major scale. (Recall that triads are built using thirds, or every other note.)
2. Finger the C major triad (C-E-G) on the top 3 strings as follows: C on the 5th fret of the 3rd string, E on the 5th fret of the 2nd string and G on the 3rd fret of the 1st string.
3. Raise each note in the chord to the next scale tone on the string. Once you find the most logical fingering, strum the chord. This is the D minor chord, referred to as the ii chord because it is built on the second tone of the major scale.
4. We refer to each chord with a Roman numeral that corresponds to the scale tone on which the chord is built.
5. Continue to do this, hitting all scale tones. In essence, you are playing the C major scale on 3 strings simultaneously with different starting points, which yields the following chords:
* C major is the I, or root chord C-E-G (1-3-5)
* D minor is the ii chord D-F-A (1-b3-5)
* E minor is the iii chord E-G-B (1-b3-5)
* F major is the IV chord F-A-C (1-3-5)
* G major is the V chord G-B-D (1-3-5)
* A minor is the vi chord A-C-E (1-b3-5)
* B minor is the vii chord B-D-F (1-b3-b5)
6. Included in this chapter is a chord shapes supplement to help you get started.
7. Next, apply the same method to harmonize the major scale using spread inversions.
8. Next, find breaking points where you can move from a lower set of strings to the next set of strings using the same concept we used with the major scale and the arpeggios. In other words, play the harmonized major scale on the 3rd, 4th and 5th strings. When you get to the final chord, move vertically and play the last chord on the 2nd, 3rd and 4th strings.
9. Next, move vertically from the lower strings to the higher strings to play the last 2 chords, the last 3 chords, the last 4 chords, etc.
10. After you master this lesson in the key of C, begin work with the other keys with the goal of playing it in all 12 keys and on all sets of strings.