(Music Sales America). This extensively revised third edition of David Harp's best-selling Music Theory Made Easy is an easy to follow treatment of a difficult subject. Without requiring the reader to know standard notation, the guide uses pictures, diagrams, and simple analogies to cover all the theory topics involved in playing and understanding blues, rock, country, pop, and simple jazz music. The 74 minute CD lets you hear what each scale, chord, and chord progression sounds like, and provides play-along tracks in commonly used keys for each style of music.