Lessons Level Four begins with a review of triads and inversions, followed by the introduction of V7 chords and inversions. New concepts include 2/2 and 3/8 time signatures, augmented and diminished triads, sixteenth notes, dotted eight notes and syncopation. Multi-key reading continues with learning scales, chords and music in E-flat, A-flat, D-flat, G-flat and B Major. The music in this book emphasizes classical literature with works by Telemann, Bach, Le Couppey, Haydn, Beethoven, Gurlitt, Streabbog, Carr, Schmitt and others.