(Piano). The Music Theory series is designed from the ground-up to explain the terminology and musical structures needed for modern applications. Level One is an introductory course which covers music notation, key signatures, basic scales, intervals, modes, diatonic relationships and 3-and 4-part chords. Level Two is an intermediate-level course covering larger chord forms, "definitive" chords in major and minor keys, substitutions, analysis of key centers in tunes, "upper structure" chords, voiceleading, and pentatonic and blues scale applications, a complete glossary of terms, and hundreds of written theory exercises with answers.