What was unusual about Guillaume de Machaut's most famous composition? A. The Messe de Nostre Dame was monophonic.

B. The Messe de Nostre Dame was the first complete musical setting of the Proper sections of the Roman Catholic Mass.

C. The Messe de Nostre Dame was the first composition by a composer of the Notre Dame school.

D. The Messe de Nostre Dame was the first complete musical setting of the Ordinary sections of the Roman Catholic Mass.

The correct answer is a.the castrati were classical singers with very high voice equivalent to that of a soprano, mezzo-soprano or contralto. this effect of high voice was produced by castration before puberty or an endocrinological condition. the castrati first started signing at the church but then they also sang at the opera. they did not only sang in italy but in many churches in europe. finally, they were singing male and female roles as well. 

answer:

thats an essay no one can write if for you

explanation:

Ithink the answer is d