Palestrina's pope marcellus mass reflects the catholic church's belief that heavenly sounds produced by trained professionals would be more spiritually powerful than the rough song of an untrained congregation.

a. True

b. False

That statement is true

He believed that the songs performed in the church is a form of worship that given to the God. Which why they believe they should give the best possible effort that they can, hence leading to the use of heavenly sounds produced by professional singers and musicians.