New York Post: YouTube’s exploding mobile traffic is creating a new source of friction between the world’s No. 1 content distributor and the music industry. Universal, Sony and Warner execs believe YouTube’s grip on free ad-supported music videos needs to be loosened — by supporting rival sites like Vessel and Snapchat. Separately, the labels are weighing going nuclear, potentially yanking rights to the web’s most valuable and highly trafficked content. “They are fed up with the lack of monetization.”