Summary: In episode 14 of Desi Sernaâ??s guitar theory podcast you take a look at the interval structure of the different modes of the major scale and how musicians would number chord progressions that are modal. This involves naming the tonic pitch in a mode â??1â?? and then numbering its other pitches from there with consideration given to any change in interval structure (for example, sharp and flat degrees). Musicians will usually call the tonic chord in a progression â??1â?? and then number the other chords by their interval relationship to the tonic. This information is needed in order to study advanced concepts like modal interchange and borrowed chords because you must identify chords that are out of key by how they relate to the tonic chord on hand and not by their position in their own parent keys. You also hear comparisons and analyze the difference between the plain major scale and other major modes and the natural minor (a.k.a. relative minor) scale and other minor modes. This free guitar lesson on music theory is based on the book Fretboard Theory Volume II that can be previewed for free at: http://guitar-music-theory.com/fretboard-theory/fretboard-theory-volume-ii/
