Robert John Arthur Halford is an English singer and songwriter. He is best known as the lead vocalist of the heavy metal band Judas Priest, which was formed in 1969 and has received accolades such as the 2010 Grammy Award for Best Metal Performance. He has been noted for his powerful and wide ranging operatic vocal style and trademark leather-and-studs image, both of which have become iconic in heavy metal. He has also been involved with several side projects, including Fight, Two, and Halford.

Ian Hill is an English musician, best known as the bassist and the sole continuous member of the heavy metal band Judas Priest. Along with lead guitarist Glenn Tipton, he is the only member who has appeared on all of the band's studio albums.