The king of Auto-Tune is taking on the Prince of Darkness.

T-Pain has released a cover of the Black Sabbath song "War Pigs." It appears on his newly released covers album On Top of the Covers, which finds the singer and rapper ditching his signature vocal effects to showcase his natural voice.

For his take on "War Pigs," T-Pain belts out the iconic lyrics about "Generals gathered in their masses" over appropriately heavy music, with some funk elements added in, as well. While it doesn't last quite as long as the nearly eight-minute original, the cover does pass the six-minute mark.

Along with "War Pigs," On Top of the Covers features renditions of songs including Journey's "Don't Stop Believin'," Sam Cooke's "A Change Is Gonna Come" and Sam Smith's "Stay With Me."

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