Following the break-up of their previous band, Mythology, in 1968, guitarist Tony Iommi and drummer Bill Ward sought to form a heavy blues rock band in Aston, Birmingham. They enlisted bassist Geezer Butler and vocalist Ozzy Osbourne, who had played together in a band called Rare Breed, Osbourne having placed an advertisement in a local music shop: “OZZY ZIG Needs Gig – has own PA”. The new group was initially named the Polka Tulk Blues Band, the name taken either from a brand of talcum powder or an Indian/Pakistani clothing shop; the exact origin is confused. The Polka Tulk Blues Band included slide guitarist Jimmy Phillips, a childhood friend of Osbourne’s, and saxophonist Alan “Aker” Clarke. After shortening the name to Polka Tulk, the band again changed their name to Earth (which Osbourne hated) and continued as a four-piece without Phillips and Clarke. Iommi became concerned that Phillips and Clarke lacked the necessary dedication and were not taking the band seriously. Rather than asking them to leave, they instead decided to break up and then quietly reformed the band as a four-piece. While the band was performing under the Earth moniker, they recorded several demos written by Norman Haines such as “The Rebel”, “When I Came Down” and “Song for Jim”, the latter of which being a reference to Jim Simpson, who was a manager for the bands Bakerloo Blues Line and Tea & Symphony, as well as the trumpet player for the group Locomotive. Simpson had recently started a new club named Henry’s Blueshouse at The Crown Hotel in Birmingham and offered to let Earth play there after they agreed to waive the usual support band fee in return for free T-shirts. The audience response was positive and Simpson agreed to manage Earth.

In December 1968, Iommi abruptly left Earth to join Jethro Tull. Although his stint with the band would be short-lived, Iommi made an appearance with Jethro Tull on The Rolling Stones Rock and Roll Circus TV show. Unsatisfied with the direction of Jethro Tull, Iommi returned to Earth by the end of the month. “It just wasn’t right, so I left”, Iommi said. “At first I thought Tull were great, but I didn’t much go for having a leader in the band, which was Ian Anderson’s way. When I came back from Tull, I came back with a new attitude altogether. They taught me that to get on, you got to work for it.”

While playing shows in England in 1969, the band discovered they were being mistaken for another English group named Earth, so they decided to change their name again (this name change would give rise to the well-known debate about the alleged aesthetic influence of Coven, which the British band always denied). A cinema across the street from the band’s rehearsal room was showing the 1963 Italian horror film Black Sabbath, starring Boris Karloff and directed by Mario Bava. While watching people line up to see the film, Butler noted that it was “strange that people spend so much money to see scary movies”. Following that, Osbourne and Butler wrote the lyrics for a song called “Black Sabbath”.

(Wikipedia)