ZEN-ON / Zen-On / Odell: Mandolin Textbook (2) Edited by Okusuke Ito / Mandolin Textbook Brand: Ongaku no Tomosha I used this textbook until the end when I was taking mandolin lessons. Therefore, there are some markings on some of the musical scores as shown in the photos. (Only a few pages because I stopped the lessons halfway through) The markings do not interfere with reading the music, so please purchase if you don't mind them.