Pop music is the name for different forms of popular, commercial  music. It had its beginning in the USA and spread throughout the whole world during the 1950s and 1960s. It is widely liked by the young people. The best known early form of pop music was "rock-n-roll"; another was "blues". A more recent development is "folk-rock". Pop music has taken the place of native music in many parts of the world; it has caused the number of people for jazz to become much smaller than it was in the 1950s and earlier, and it has now begun to rule musical stage productions. It's a big industry. Much pop music is without artistic value, but the work of some pop singers, e.g. the Beatles, Bob Dylan, the groups like Floyd and Crosby, Stills and Nash, is on a higher musical level. And there is still a great interest in it today. Pop music concerts and festivals are held all over the world. *ks*5u According to the article, the number of people for jazz in the 1950s and earlier was   _   it is today.
much greater than much smaller than as great as as small as