Music__________. [originaltext] Music is often divided into several categories

Music is often divided into several categories. Some of the categories are: classical-music, traditional music, rock music, and jazz music.
   The first kind of music is classical music, originated in Europe a few hundred years ago. Most of the original classical music was composed in Italy, Germany, Austria. Beethoven and Bach were two famous composers of classical music. It is usually played by a variety of string instruments and wind instruments.
   The second type of music is traditional music. It is music that comes from a particular culture. Each culture has its own traditional music that is played by special instruments.
   Another kind of music is rock music, It probably began in Europe about 30 or 40 years ago, Rock is generally a loud kind of music, played with a strong beat. Rock musicians often use electric instruments, such as electric guitars and electric pianos. But other instruments can also be used.
   The fourth kind of music is Jazz. It probably comes from Africa originally. Jazz has a different kind of rhythm from other kinds of music. A variety of musical instruments are used to play this kind of music, especially wind instruments.
16. How many groups can music be divided into?