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根据短文内容，回答下列问题。
Jazz is a type of music. Some people say that jazz is America's only true art form. That's because it began there. Hundreds of years ago, black people worked as slaves (奴隶) and made up songs to pass the time. It wasn't called jazz then, but the way the slaves were playing and singing music was special.
The music of America's black people began to be called jazz in the early 1900s.
What makes jazz special is improvisation(即兴创作). That means making the music upon the spot(当场).No music in front of you. No long discussion with other people in your band.
“It's free. It's beautiful, "says Geoffrey, a sixth-grader at Stratford Landing Elementary School. Geoffrey is such a good musician that he has performed at the Kennedy Center.
Geoffrey says, "It's easy to express your feelings through jazz. You should focus on being creative and using your imagination in jazz."
Washington, D.C. is a very important place in the history of jazz. It has a famous jazz piano player: Duke Ellington.
Born in Washington in 1899, Ellington as a child wanted to play baseball instead of the piano. But his parents played the piano, so he started playing the piano when he was seven years old.
In 1920, he played small shows at the Howard Theater. When he was 24, he moved to New York, but he didn't forget his hometown. He called his band the Washingtonians and later he returned to perform at the Lincoln Theater.
