(Guitar). The concepts and fingerings in this book have been developed by analyzing the licks used by Charlie Christian. Chord shapes are moveable; thus one can play the riffs in virtually any key without difficulty by simply moving the shape, and fingerings used to play them, up or down the fingerboard. The author shows how the chord shapes F, D and A are formed, then can easily be modified to major, minor, dominant seventh and diminished seventh chord voicings. Analyzing licks frequently used by Charlie Christian, Joe has identified a series of what he calls tetrafragments, i.e., the core element of a lick. The identifiable "sound" of a particular lick is preserved regardless of how many notes are added on either side of it, e.g., pickup notes or tag endings. Many examples are shown and played on the CD of how this basic concept was used by Charlie Christian to keep his solo lines moving forward. Weidlich also makes observations on the physical manner Charlie Christian used in playing jazz guitar and how that approach contributed to his smooth, mostly down stroke, pick technique.