Joe Satriani's Guide to Building Chords from “Stacked” Fourths
If someone had mentioned the term “stacked fourths” to me years ago, I would have had no idea what they were talking about. But I later learned that it is really quite simple and represents a cool approach to constructing chords. In this lesson, I’d like to show you some interesting things you can do with stacked fourths. In music theory, every note in a chord can be assigned an intervallic number.