The existence of the roei “Kyo ni wa daimoku tari” is known from an interesting anecdote recorded in Tachibana no Narisue's Kokon chomon-ju, and it is also included in the first volume of the Wakan roei-shu. However, until recently, the existence of musical notation for the piece was unknown. It is not found in the most widely known of the extant musical manuscripts recording the Toke (Fujiwara family) tradition of roei, the Roei yosho (Inku-bon), Roei yosho (Gyozan-bon), the Roei yoshu, and the Roei-shu of Yomei Archive, Kyoto.
I have had the opportunity since the year before last to work in a veritable treasure house for medieval historical source materials, the Kanagawa prefectural Kanazawa Bunko. Here a single volume, previously mentioned in scholarly literature, has been found to contain the roei in question, complete with musical notation. The manuscript, a hand-copied single volume measuring 13×21cm, is a sadly damaged specimen in kari-toji binding, which contains only 14 roei. It once belonged to the Shomyoji temple monk Jochin (ordained in Oan 2nd year, 1369), a shomyo musician of considerable skill who is known from a large amount of other historical material.
In total, there are five roei manuscripts surviving in Kanazawa Bunko, which preserve 29 roei (three appear more than once). Other than the roei mentioned above, musical notation for a second, “Shizen yoru takenu”, is also known only from these sources. In addition, a Japanese-reading version of a roei usually performed in its Chinese-reading version, “Kashin reigetsu”, as well as an extremely rare example of notation for two roei in the five-note notational style invented by the Buddhist monk Kakui are included. These materials are to be published later this year, in photographic reproduction complete with typographical reprint and bibliographic commentary, in Kanazawa bunko shiryo zensho: kayo, shomyo-hen, Vol. 1.
As well as participating in the preparation of this book, I have taken the opportunity while engaged in examining the musical sources held in Kanazawa Bunko, to photograph the collection there for inclusion in the material held at the Research Archives for Japanese Music, Ueno Gakuen College. In addition, a second volume is planned in the series of photographic reproductions of material held in Kanazawa Bunko mentioned above.

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