Bastien Piano Basics, Piano, Level 3 (ISBN 084975268X)- relative minor scales (a and d); D-flat, A-flat, E-flat keys * Bastien Piano Basics, Theory, Level 3 (ISBN 0849752752)- further discusses the concepts presented in Piano * Bastien Piano Basics, Performance, Level 3 (ISBN 0849752779)- 18 supplementary pieces correlated with Piano * Bastien Piano Basics, Technic, Level 3 (ISBN 0849793025)- exercises/drills from Hanon, Schmitt, Czerny, Bastien.