The New York Post reports that John Mayer left up to 10 messages a day on what he thought was Kanye West’s cellphone, trying to talk the rapper into working with him. Unfortunately, Mayer was phoning West’s former number, which now belongs to a publicist on the West Coast. Mayer’s desperation led him to create a rap for West about how great Kanye is and how much Mayer wanted to work with him. “It was hilariously bad,” said a source. “The two are friends and collaborators who, yes, do leave messages for each other,” confirmed Mayer’s rep Ken Sunshine.