This is a teaching material for enjoying ensemble music across all ages, from young children to seniors. The level ranges from beginner to around the level of elementary sonatas. There are various parts. Please refer to the table of contents. A good point about ensemble is that you can learn musical elements in a fun way, different from solo lessons. If you develop your listening skills and can objectively listen to your own performance, it will also be useful for solo playing. The latter half of volumes 2 and 3 also include challenging pieces. I purchased this for 4738 yen at the time. I am not considering selling volumes 1, 2, and 3 separately. No writing, and in good condition. Please check the storage condition in photos 8-10. Only volume 3 has some discoloration on the spine. For those who understand. Instant purchase is welcome.