Further bolstering its cache of management clients, Jonas Group Management President Jared Rosenberg announced today that the company has signed A-list music producer Adam Blackstone for exclusive management representation. The news comes as Blackstone’s four episode run as a music coach on NBC’s hit show “The Voice”, comes to an end. Blackstone has been working with Adam Levine’s team of musicians competing for the top prize. Blackstone is considered to be one of the industry’s top music directors/producers. He has collaborated and toured with such artists as Eminem, Jay-Z, Maroon 5, Janet Jackson, Drake, and Kanye West, among many other top-flight performers.