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

Earth: The Legendary Lost Tapes will be released on July 25 on CD and vinyl via Big Bear Records. Black Sabbath are on the cover of the new issue of Metal Hammer, out now. People have criticized the move because they feel the songs will disproportionately bolster the LP's numbers.