Pop or popular music singers make much money.They make a CD or tape which radio stations use in many places. Once a popular singer is heard all over the country，young people buy his or her tapes.Some of the money from these tapes goes to the singer.Wherever the singer goes，all the young people want to meet him or her.Now the singer has become a national star. There are other kinds of music that are important to Americans.One is called folk music.It tells stories about the common life of Americans.Another is called western or country music.This was started by cowboys who would sing at