The Tory leader appealed to the British Phonographic Industry to bring its influence to bear on the pro-violence culture blighting Britain's youth, writes Hélène Mulholland in an article in The Guardian.
Mr Cameron said that combating this culture should not be the job of the government alone: "I am not calling for censorship, legislation or the banning of content. I am calling on you to show leadership, exercise your power responsibly and to use your judgement."