 Jacob joined Harry McCune's son, Harry McCune, Jr., in developing the new concept of musicians touring with their own sound system.Jacob's old schoolmate Gericke was now a record producer working with people such as Lou Adler of Dunhill Records, and through this connection Jacob was introduced to Bobby Roberts, Dunhill's touring manager.Roberts asked Jacob to fix the problems which were being experienced on the road by the Mamas and the Papas, who were touring in support of their big radio hits "California Dreamin'" and "Monday, Monday".