Two-volume set of piano instruction books, "Learning Piano by Ear" by Ziegler. - Title: Das innere Hören by Ziegler - Author: BEATA ZIEGLER - Contents: Piano instruction book for learning by ear - Publisher: Ongaku no Tomo Sha - Size: Two-volume set, large and small format Thank you for viewing. This is a two-volume set of "Preparatory Exercises and Etudes for Basic Movements" and "For the Instruction Book for Learning by Ear." I am selling these as I no longer use them. I am also listing Ziegler's volumes 1, 2, and 3 separately. Please consider those as well. As these are old materials, there is some discoloration. Please refrain from purchasing if you are concerned about minor details. I have a cat.