Robert John Arthur Halford is best known as the lead vocalist for the heavy metal band Judas Priest. Halford has a nearly four octave vocal range, having recorded notes from D2 to B5, though it is rumored that he has reached notes as high as G♯6 on at least one occasion during a performance in 1975. He is one of the most respected singers of heavy metal and rock music with a quasi-operatic vocal style and high pitched screams.