Currently in the studio recording their highly-anticipated reunion album, heavy metal pioneers Black Sabbath have released a 25-minute video clip of the group's 1975 performance on 'Don Kirshner's Rock Concert' that reminds fans of just how great classic Sabbath really were.

Posted to Sabbath's official YouTube channel, the clip featured above offers the group's original lineup of Ozzy Osbourne, Tony Iommi, Geezer Butler and Bill Ward performing the songs 'Killing Yourself to Live', 'Hole in the Sky', 'Snowblind,' 'War Pigs' and 'Paranoid.'

The group were promoting their sixth studio album, 'Sabotage,' which featured 'Hole in the Sky' as its lead track. 'Don Kirshner's Rock Concert' ran in syndication from 1973 until 1981, featuring many of the top rock acts of that era performing live in concert -- a rarity in those days when most "live" music performances on television were lip-synched. Sabbath's original lineup would last for just two more albums before Osbourne's forced departure, after which he became one of the unlikeliest solo superstars ever.

Black Sabbath (minus Bill Ward) are currently in the recording studio with producer Rick Rubin working on '13' -- the group's first studio record to feature Osbourne on vocals since 1978's 'Never Say Die.' Sitting in the drummer's chair is Brad Wilk from Rage Against The Machine. The album is due for release in June.

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