What is the name of the flute solo, the opening song of the Tang Dynasty?

O(∩_∩)O~ If I remember correctly, it's Acropolis or Three Butterflies in Yangguan. I remember I put it at school.

At that time, when I was studying Tang Poetry and Song Poetry, I put it on purpose.

You can look for it.

O(∩_∩)O~ Good luck.