The Michael Aaron Piano Course Lesson books have been completely re-engraved expanded (adding more definitions of musical terms and more musical pieces) updated (with modernized artwork) and re-edited (with less emphasis on fingerings and more on note-reading). The Michael Aaron Piano Course Lesson books have been completely re-engraved expanded (adding more definitions of musical terms and more musical pieces) updated (with modernized artwork) and re-edited (with less emphasis on fingerings and more on note-reading).