Announcers frequently participate in community activities. Sports announcers, for example, may serve as masters of ceremony at sports club banquets or may greet customers at openings of sporting-goods stores. Radio announcers who broadcast music often are called disc jockeys (DJs). Some DJs specialize in one kind of music, announcing selections as they air them. Most DJs do not select much of the music they play (although they often did so in the past); instead, they follow schedules of commercials, talk, and music provided to them by management. While on the air, DJs comment on the music, weather, and traffic. They may take requests from listeners, interview guests, and manage listener contests. Many radio stations now require DJs to update their station Web site.