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an organum is a form of early polyphony based on an existing plainsong.
a polyphony is the style of simultaneously combining a number of parts, each forming an individual melody and harmonizing with each other.
a gregorian chant is church music sung as a single vocal line in free rhythm and a restricted scale (plainsong), in a style developed for the medieval Latin liturgy.
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Answer:
How to Reduce Exam Stress During exam season, both your anxiety levels and academic performance are influenced by: what you consume. 
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Answer:
repetition of ideas.
Explanation:
Look for repetition of ideas when there is so much information to find main idea
 
        
             
        
        
        
Answer:
Although Martin enjoys playing sports, he does not like running.
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