Producer Rodney Jerkins, a heavyweight in the pop music world who's worked with an array of A-list artists, is looking for new acts for McDonald’s. Jerkins and his Chicago-based company, Artists & Brands, are mining new musical talent from the rap and R&B world, coaching young artists on the art of a catchy hook, then offering the tunes to companies such as McDonald's (their main sponsor) for use in their commercials.