Piano Party is the core book for all four levels of the Bastiens’ Invitation to Music series. All new concepts are introduced in the Piano Party books. Piano Party, Book D expands reading to positions in D, A, E (Group 2); Db, Ab, Eb (Group 3); and Gb, Bb, B (Group 4). Flats and sharps, more dynamic markings, and key signatures are presented. As begun in Book C, students are asked to write the counts in every piece indicated by the pencil icon. "Weekly Tune-Up" practice directions and accompaniments enhance home practice.