In 1971, for the "Tears of Joy" tour, Ellis added a string quartet to his band. The instruments were amplified using newly developed pick-ups made by Barcus-Berry so that they could be heard over the brass and saxophones. These new timbres offered Ellis a wellspring of creative possibilities. As he explained, "People spend whole evenings listening to a brass quintet, a woodwind or string quartet, so I reasoned that having ALL of these in the context of a big band should give us a fantastic variety of colors from which to draw."