Question

giovanni pierluigi da palestrinas pope marcellus mass was once thought to have been written in order to meet the requirements set forth by whom? council of trent council of nicea pope marcellus

Explanation:

The Council of Trent aimed to reform church music. Palestrina's Pope Marcellus Mass was thought to be a response to its requirements for clarity and reverence in sacred music. The Council of Nicea was an early - church council unrelated to this, and Pope Marcellus was not the one who set these specific musical requirements.

Answer:

Council of Trent