Level 4, the final level in the Celebrate Piano series, offers solid, pedagogically-sound learning at the intermediate level.  Carefully written and selected pieces are offered in each of the six units. New concepts include syncopation; Major scales in tetrachords; chord inversions; pentatonic and whole-tone scales; binary form; relative, natural, and harmonic minor scales and much more.  As in all Lesson and Musicianship books in this series, repertoire, technique, theory, ear-training and creativity/composition are all included in one book.