The mathmatical system of perceptive that was not used for almost 1000 years after the fall of rome when did artist use it again

Read the excerpt from act l, scene i of romeo and juliet. what is the cause of romeo's despair? benvolio: groan! why, no; but sadly tell me who romeo has wronged benvolio. romeo misses his friends and family romeo wants to fight the capulets. romeo is in love with a woman romeo: bid a sick man in sadness make his will: ah! word ill urg'd to one that is so ill. in sadness, cousin, i do love a woman save and exit

For the difference command to work, what needs to happen?

In a paragraph of no less than 125 words, explain the single most important factor involved in advancing american classical music in the twentieth century.