Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the answer to each of the questions. American jazz is a mixture of sounds borrowed from such varied sources as American and African folk music, European classical music, and Christian gospel songs. One of the recognizable characteristics of jazz is its use of improvisation: certain parts of the music are written out and played the same way by various performers, and other improvised parts are created ...

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the answer to each of the questions.

American jazz is a mixture of sounds borrowed from such varied sources as American and African folk music, European classical music, and Christian gospel songs. One of the recognizable characteristics of jazz is its use of improvisation: certain parts of the music are written out and played the same way by various performers, and other improvised parts are created spontaneously during a performance and vary widely from performer to performer.

The earliest form of jazz was ragtime, lively songs or rags performed on the piano, and the best-known of the ragtime performers and composers was Scott Joplin. Born in 1868 to former slaves, Scott Joplin earned his living from a very early age playing the piano in bars along the Mississippi. One of his regular jobs was in the Maple Leaf Club in Sedalia, Missouri. It was there that he began writing the more than 500 compositions that he was to produce, the most famous of which was "The Maple Leaf Rag."

This passage is mainly about________.