Bill Ward

William Thomas "Bill" Ward (Bill Ward), born 5 May 1948, Aston, Birmingham, England, is an English musician, best known as the original drummer for the British heavy metal band Black Sabbath. In addition to playing drums as an original founding member of the band, Ward sang lead vocals for two Black Sabbath songs; "It's Alright" from Technical Ecstasy and "Swinging the Chain" from Never Say Die!. He also coined the term "downer rock." Ward's drumming often closely doubled the bass and guitar riffs. An example of this is the song "Iron Man" on the Paranoid album.

Tony Iommi

Anthony Frank "Tony" Iommi, born 19 February 1948, in Aston, Birmingham, England is an English guitarist and songwriter best known as the founding member of heavy metal–pioneer band Black Sabbath, and the sole constant band member through multiple personnel changes. Iommi is widely recognised as one of the most important and influential guitarists in heavy metal music. According to Allmusic, "Iommi is one of only two guitarists (the other being Led Zeppelin's Jimmy Page) that can take full credit for pioneering the mammoth riffs of heavy metal."