In which period did the dance music in The Change of Pure Land in the West have important data value?

Tang dynasty. The Change of Dancing Music in the Pure Land of the Western Heaven describes a band composed of six people on both sides. In the middle, a maiko plays the pipa and dances while playing, with a very graceful posture. The whole picture is concise and smooth, with soft colors, which not only has high artistic value, but also has important data value for studying the sounds, dances and costumes of the Tang Dynasty.