In the Noh play "Tsunemasa", the story was about the happening at the night of the salvation of Tsunemasa's soul. Tsunemasa, a certain prince of the House of Taira, who had died in the Battle of the Western. While Tsunemasa was still in the world, he really enjoyed playing his lute “the Green Hill”. Therefore, the priest Gyokei was bidden by his master to dedicate the lute to Buddha and to perform a liturgy of flutes and strings for the salvation of Tsunemasa's soul. The sound of prayers brought the ghost of Tsunemasa back to the world and appeared in a visible shadow. However, no one in there could see him because Tsunemasa was asham