What is the tone quality of a sound and it is what to distinguish one musical instrument from another?

Bile juices in the breakdown of fats. an injury to the (liver, mouth, or salivary glands) may cause a decrease in the production of bile juices. this decrease in bile juices may lead to decreased production of (amino acids, carbohydrates, or fatty acids)

Examine the piece above. what is the subject matter in this piece? what is the content?

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