At first glance, this file looks like an ordinary file. Actually, it is a patented product (Japanese Patent Registration No. 6505669).
This is the “note-Note music score file” sold by Music Eight Co. By holding the paper (sheet music) in place with the four corners, it does not get in the way of writing. The applicant is a joint application between Music Eight and Tanpopo Co. Ltd. In addition, “Note-Note” is also a registered trademark (Japanese Trademark Registration No. 5738437).
When I was a student, I used to use various methods to make use of sheet music, such as using drawing paper or connecting pieces of paper together with cellophane tape, but now I’m impressed to see how convenient this product is.
This has been an autumn of art for me, and I feel that I might want to try working on music again. (Marron)
Website :The “note:Note” file for writing on sheet music (Japanese only)
https://www.music8.com/user_data/notenote_04.php