Watch the Guitar Lab: ii V I Options online guitar lesson by Brad Carlton from Guitar Lab: ii V I Options
The concept of harmony can be an overwhelming subject. This is because of the math that's involved. When you're studying multiple voices in which each voice is a separate melody, the options really start to add up. My goal with this series of courses is to teach you how to view information on the fingerboard by playing standard progressions through which you will be focusing on voice leading as you apply various harmonic options.
The ii V I progression is one most important building blocks in all of music. We will begin by focusing on guide tone/root structures. These will form the foundation upon which we will then add various voices on different strings. This method is far superior than the standard way of applying a number of "grips" in which there is no consideration for the melodic voice leading. An added benefit of this approach is that it will give you melodic moves that are grounded over harmonic progressions which you can use when you're soloing.
You will be given many examples of ii V I progressions in the key of D major. You'll then learn how to use these as models for developing your own voicings. In addition to strengthening your theoretical understanding of chord/ scale relationships, you'll be challenged with various fingering options. Some of these may seem a little radical at first, but the ability to sustain voices will be the reward for your technical struggles.