Panama Kinal on Instagram: "Rob Halford and Ronnie James Dio stand as two of the greatest singers in heavy metal history but their styles could not be more different. Halford fronting Judas Priest unleashed a voice that could soar into screaming highs and cut through walls of guitars like steel. He gave metal its piercing power and leather clad energy. Dio on the other hand brought a completely different force. With Rainbow Black Sabbath and his own band Dio he delivered an operatic voice filled