What is the principal ingredient in glass?

Two of the earliest known musical directors who composed for the Cathedral of Notre Dame during its construction were

A) Leonin and Perotin. B) Binchois and Josquin des Prez. C) Palestrina and Landini. D) Machaut and de Vitry.

The music of the Beach Boys is simple and folk-like

Indicate whether the statement is true or false.