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 either into Alfred's Basic Piano Library Prep Course Level C or Alfred's Premier Piano Course Level 1B.