Geezer Butler

Geezer Butler, born Terence Michael Joseph Butler on 17 July 1949 in Birmingham, England, is an English musician and songwriter. Butler is best known as the bassist and lyricist of heavy metal band Black Sabbath. He was also involved in Heaven & Hell from 2006 to 2010. Butler formed his first band, Rare Breed, with old friend John "Ozzy" Osbourne in the autumn of 1967. Separated for a time, Osbourne and Butler reunited in the blues foursome, Polka Tulk, along with guitarist Tony Iommi and drummer Bill Ward. They renamed their band Earth, but after finding a band in the small-time English circuit with the same name, soon adopted Black Sabbath in early 1969.

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."