What is the writing material of violin concerto Butterfly Lovers?

The violin concerto "Butterfly Lovers" is based on the aria of Yue Opera.

According to relevant information, the violin concerto "The Water Margin and Zhu Yingtai" is a single-movement violin concerto based on the popular folk story "The Water Margin and Zhu Yingtai" and the music of Yue Opera.

Composed by He and Chen Gang, the song adopts sonata form, and skillfully selects three main plots from the story, namely, "Marriage at Caoqiao", "Marriage at Yingtai" and "become a butterfly at the grave", describing butterfly lovers's love tragedy, and accusing and lashing the risk ethics.