Book excerpt: Don Mock, master guitarist and educator, reveals his favorite chord voicings and comping concepts and demonstrates them in the context of soulful jazz and blues chord progressions that are easily applied to any situation. Includes: the "best" and most useful chord voicings, chord extensions and alterations, chord substitution and secondary dominants, powerful "half-step connections," and several complete 12-bar blues progressions. Includes tab booklet.