Radio and television announcers present music or the news and comment on important current events. Announcers are expected to be up to date with current events or a specific field, such as politics or sports, so that they can comment on these issues during their programs. They may research and prepare information on current topics before appearing on air. In addition, announcers schedule guests on their shows and work with producers to develop other creative content. Radio and television announcers also may be responsible for other aspects of television or radio broadcasting. They may operate studio equipment, sell commercial time to advertisers, or produce advertisements and other recorded material.