Quartal harmony deals with guitar chord shapes and chord voicings that are built in 4ths rather than 3rds. This type of harmony is used by pianists and guitarists alike and utilizes voicings that can be used in many settings. Quartal voicings, and their inversions, are displayed in the DVDs accompanying chart with very clear diagrams making it very easy to learn and understand this type of harmony. The 69-minute DVD not only presents teaching material, but also provides a play-along essence that will allow students to hear how to apply these great chord voicings.