Cloistered Emperor
is an anthology of "imayō" 今様 songs. Originally it consisted of two collections joined together by Cloistered Emperor Go-Shirakawa: the "Kashishū" 歌詞集 and the "Kudenshū" 口伝集. The works were probably from the repertoire of the Emperor's tutor, the aged singer Otomae, whose superlative mastery of the art derived from four generations of teachers. Only a fragment (about 10%) of this work is still extant.