Summary: In an earlier guitar theory podcast episode you learned about chord progressions and how to play by numbers. Although a great approach to many songs, you may have realized that not all of them fit into this system of numbered barre chord patterns. In this free guitar lesson you are going to learn why. Here you will look at several related topics including: modulation, key changes, modal interchange, borrowed chords, and the circle of fifths, also known as the circle of fourths. This information comes from the book Fretboard Theory Volume II Chapter 4. Download a free book preview at: http://guitar-music-theory.com/fretboard-theory/fretboard-theory-volume-ii/
