Thank you for your comment. It's a traditional japanese court song called 'Saibara'. It is a style of ancient music. Saibara was sung in the medieval period. The title of this song is ' Hashirii. It is the text of this song. Hashirii no kokaya kari osame kake soreni koso mayu tsukurasete ito hiki nasame ( I cut small KAYA of the water drawer ground flowing like a brick, and put it. And then silkworms will spin cocoons, and let's pull silk.)
I'm very grateful for your reply, thank you! I am very interested in medieval Japan and this helps me form a better image of the time and its people. This is wonderful.