The four men who first joined forces in 1968 as the Polka Tulk Blues Band before briefly trying on Earth to record a number of demos in 1969 that were never released. They soon adopted their more familiar name, the one they will be billed as at what is being called the group's final-ever concert on Saturday (July 5) in their hometown of Manchester.

The upcoming collection contains tracks the metal greats recorded in 1969, when they were performing under the name Earth

An unreleased collection of Black Sabbath music called, ‘The Legendary Lost Tapes,’ is set to be released July 25, featuring rare 1969 demos recorded under their original band name, Earth. Earth featured Ozzy Osbourne,