What's that dance song where the emperor dances for Yang Guifei in a mask? It's not that Neishang what.

The Neishang Yuyi Song. Speaking of "Nishang Yuyi Song" naturally to say to China's Tang Dynasty, a king Li Longji. According to legend, Li Longji once dreamed of traveling to the Moon Palace, heard the heavenly fairy music playing music, dressed in neisang feather clothes of the fairy dancing. The song of the fairies was subtle and beautiful, and the dancing fairies danced. When Li Longji woke up, he still remembered the scene in his dream clearly. He wanted very much to record the music in his dream, let the musicians play it, and let the singing nymphs dance. He kept thinking ah think ah think, think of a little on the record, even during the day when the court, he still carries a jade flute in his arms, while listening to the minister read the book, while secretly pressing the holes on the jade flute underneath the flute, looking for tunes, he was mesmerized by the immortal song, but not all of the song. Very agonizing. Once, Li Longji came to Sanxiang translation, he looked toward the distant daughter of the mountains, rolling hills, smoke and clouds. At once produced many beautiful fantasies. He remembered all the immortal music he heard in his dream. Immediately recorded it on the score. He composed a great palace music suitable for playing in the palace. Li Longji ordered the musicians to rehearse the Nishang Yuyi Song and made his beloved concubine Yang Yuhuan design the dance. In order to let them have a good place for rehearsal, Li Longji established a Pear Garden (which was later generalized to mean a place for singing opera) in the palace. Yang Yuhuan and the court rushed to rehearse day and night. Finally, a large-scale song and dance, "Neishang Yuyi Qu", was practiced and performed at a grand festival. Delicate and beautiful "Nishang Yuyi song" fairy music played, Yang Yuhuan with the court ladies singing and dancing, one is like a fairy down to earth, the eyes of the courtiers are looking straight .