on the right side of Okurumayose, there's the Shodaibunoma building, which was used as a waiting room for official visits to the Palace by dignitaries. They were ushered into three different anterooms according to their rank.
In this room, you can see a full scale reproduction of the ancient dance and music performance called Yamatomai, which was based on the manners and customs of the Yamato district (the current Nara prefecture).
It was performed in the Daijosai (Divine Ceremony after the Enthronement). The players of the traditional music instruments called Beiju and four court dancers performed to their music and a song.