Lesson Book 4 is the last in the Music for Little Mozarts series. Aftera review, the new concepts taught are: Flat and sharp sign; Tie; Cresce ndo and diminuendo. After reviewing C position and Middle C position, G position is taught. All three positions are used alternately throughoutthe 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.