Book excerpt: (Book). If you'd like to know about music theory but don't want to get bogged down in a stuffy college-level textbook, this guide was written just for you! It's a practical, no-nonsense book ideal for: young musicians learning guitar so they can play rock, folk or blues; DJs who've started recording their own tracks and need to know how chord progressions work; anyone who wants to play from the chord symbols in sheet music; classical musicians who want to do more than just "read the dots," and countless others. Covers: intervals, scales, modes, triads and advanced voicings; interpreting chord symbols and reading sheet music; voice leading, chord progressions and basic song forms; classical, jazz & pop; and more, with helpful quizzes and answers.