Which element of music talks about the combination of different melodies that sound as one?

Middle Ages are also known as the Dark Ages or _______ Era.

One of the reasons for the Dark Ages when Rome was divided because it failed to enforce its rule.

Feudalism allowed each one to be of help to one another, making each other an important citizen no matter the social status.

It was called the Black Plague because all dark skinned people were discriminated.

The Ut Queant Laxis was the source of the So-Fa Syllables, or the Do, Re, Mi, etc.

The Gregorian Chants are sung with instruments.

This characteristic of the Gregorian Chant means that singers must mean what they sing.