Theory & Ear Training Party books correlate with their respective level Piano Party books. They provide reinforcement of the concepts presented in Piano Party, especially through listening and writing plus improvising and composing activities. Students learn through sequential games and exercises designed to hold their interest. Book D expands reading to positions in D, A, E (Group 2); D-flat, A-flat, E-flat (Group 3); and G-flat, B-flat, and B (Group 4). Flats and sharps, more dynamic markings, and key signatures are presented. As in Book C, students are asked to write the counts in every piece indicated by the pencil icon.