How does Gerald Abraham, an English musician, evaluate the singing and dancing performances of Surrey priests?

Gerald Abraham, an English musician, said, "The priests of Surrey (priests of gladys, the god of war, who sang and danced in the streets of Rome on the first day of March every year) and the earliest tibial performance groups all came into being during the legendary reign of King Nouma Pompeius in the 7th century BC. Before the harvest, the priests of cultivated land who walked in the fields or suburbs also sang; It can be seen from some signs that both Surrey Pastoral Corps and Farmland Pastoral Corps adopt the form of response singing or alternate singing. This annual religious ceremony, religious groups and other innovations mark the most solid milestone in the history of Roman music. "