I recently obtained "Ryukyu Shimauta Ee Yon" from a sanshin shop in Okinawa. This "Ee Yon" is a "limited edition" and was "newly released," so I bought a lot of them and decided to sell some on Mercari. After checking the contents, as expected, it's a well-made "Ee Yon," supervised by the "Ryukyu Ongaku Gakufu Kenkyujo" (Ryukyu Music Score Research Institute), which produces "Ryukyu Minyo Ee Yon." I recommend purchasing this "Ee Yon" as it's difficult for people outside of Okinawa Prefecture to obtain. The regular price is ¥2,500 (excluding tax), but I purchased it in Okinawa, so I've slightly increased the price. Please consider purchasing a copy. Note: This book has some binding errors, so please refrain from purchasing if you are sensitive to such issues. The book has some irregularities from the binding process. The contents are intact.