I am the music librarian for a local chamber orchestra. Readers may not be aware that music is often printed on paper larger than normal letter stock. In some cases a given composition may be printed on several different sizes of paper. The storage must thus be fairly high capacity and flexible to handle the various sizes. These folders meet these requirements and are durable as well. I also like the fact that one can attach multiple tags to a folder. This is great for music where one needs to identify the cocomposer the piece and the instrument