多选题 Sometime during the 1950's, rock music permanently ousted jazz from the music scene. This is evident from the behavior of youths of that time. In crowded nightclubs they would applaud rock acts enthusiastically. But when a jazz act began, they went outside and got refreshments. They came back in only when the jazz set was finished.
Which of the following statements, if true, is a valid objection to the conclusion drawn above?

• A. Jazz is the most important musical contribution of the United States to world culture.
• B. Although some young people who attended nightclubs in the 1950's did try to listen to jazz, they eventually became bored with it.
• C. Since the 1960's, rock music has not only provided youths with recreation but has, as well, become a rallying point for making social statements.
• D. Although by 1960 jazz performances were less popular, there has since been a revival of interest in jazz among middle-class professionals.
• E. Jazz steadily increased in popularity between the 1930's and the 1950's.