A quintet specializing in music from the middle ages is do a Black Sabbath Tribute

An Estonian record company has released an album of Black Sabbath songs played by a quintet specializing in music from the Middle Ages and singing in the main literary language of that era, Latin, according to the Associated Press. ``If you take away the massive wall of sound from many Sabbath songs, what you have is pure 14th century music,'' producer Mihkel Raud said. The 12-track album—called Sabbatum, Latin for sabbath—includes such tunes as ‘Wheels Of Confusion’ (`’Rotae Confusionis’) and ‘War Pigs’ (‘Verres Militares’), among others.

Source: BW&BK