What if Ozzy Osbourne fronted Metallica? Or how about if James Hetfield was flanked by Tony Iommi and Geezer Butler? It's a dream scenario brought to life in mash-up form courtesy of Megatallica mash-up mastermind The Taskmaster.

And the Blacksabbica mash-up is more than just an audio delight as The Taskmaster also matches video footage that makes it appear that Ozzy Osbourne and members of Black Sabbath have joined Metallica onstage for an odd blend of the songs 'Sad But True' and 'Children of the Grave' for 'Sad Children of the True Grave.'

"It took a lot of work but I wanted to see what it'd be like to exchanged all band members periodically like having Tony and Geezer playing with James and Lars, etc.," said The Taskmaster in his description of the video.

He's also combined Black Sabbath's 'After Forever' with Metallica's 'Fade to Black' in a video that can be seen below. This follows on the heels of several Metallica / Megadeth mash-ups, including 'Disposable Holy War Heroes,' 'Sandman Symphony' and 'Welcome to My Darkest Hour.' To check out more of The Taskmaster's mash-up work for metalheads, visit his Facebook page here.

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