The John Thompson Piano Course - Easiest Part 5 Supplementary Books 1-b 2-b is a set of sheet music books designed for piano players, specifically focusing on musicals and educational genres. Published by The Willis Music Co. in the United States, this set includes three books filled with exercises and songs to help piano students advance their skills. With a beginner-friendly format, these books are perfect for those looking to expand their piano knowledge and repertoire.