Joe Satriani’s Guide to Stacked Fourths

http://www.guitarworld.com/joe-satrianis-guide-building-chords-stacked-fourths-video/25929

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. Typically, we’re dealing with scales built from five to eight notes, and each note is given a number to represent its placement within the given scale.