Lesson Book 4 is the last in the Music for Little Mozarts series. After a review, the new concepts taught are: Flat and sharp sign; Tie; Crescendo and diminuendo. After reviewing C position and Middle C position, G position is taught. All three positions are used alternately throughout the rest of the book, with flat and sharp notes incorporated. When the student is finished with Lesson Book 4, he/she moves into Alfred's Basic Piano Library, Prep Course, Level C or Alfred's Premier Piano Course, Level 1B