Watch the Colorful Pedaling online guitar lesson by Matthieu Brandt from Guitar Lab: Triads and Hendrixian Double Stops
Extending a chord with some colors becomes real easy when you know the major and triads from the key you are in. By playing a triad on top of a bass note from another triad OR even "super imposing" triads you can create all kinds of cool effects. The longer you lay an alternative triad down the more the added color will stick out.
In this lesson we'll start researching this simple but powerful idea.