شرکت در آزمون آنلاین انگلیسی نهم - Personality | آزمون شماره 974

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No one knows for sure when music began. Perhaps while people were working, they began to chant or sing to make the work go faster. People who were repeating movements-picking crops or rowing boats, for example, could sing or chant in time to the work. Navajo Indians, for example, had corn-grinding songs. Many cultures developed work songs.

     Over time, people developed musical instruments. They might have started by clapping their hands and stamping their feet. Sticks and objects that rattled could have replaced the human body as early instruments. Both instruments and music became more complex with time.

Today, music is divided into art music and music of the people. Art music, which we call classical music, is more complicated than the music of the people—folk music and popular music. Art music is generally harder to write and perform. Musicians who perform it need a lot of training. Popular and folk styles typically are easier to create, perform, and understand.

The passage is mainly about ……... .

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