As music sales continue to drop like they’re not so hot throughout the industry, Island Def Jam Music Group is jamming on a new business model: integrating brands into artists’ CD booklets. The first deal, created for the Mariah Carey release Memoirs of an Imperfect Angel on Sept. 15, is a 34-page co-production with Elle magazine that includes lifestyle ads from Elizabeth Arden, Angel Champagne, Carmen Steffens, Le Métier de Beauté and the Bahamas Board of Tourism.