Dave is now gonna say something anticlimatic like "Black who?" or "I wasn't aware they had covered this song" or "My dad was a Methodist preacher, I wasn't allowed to listen to Black Sabbath at home" or something similar, watch this space.
Actually, those early Sabbath albums had quite a bit of blooze content. You could hear where they came from. I always thought that early Sabbath owed their share to Cream and Mountain, they sounded a bit like those two bands on a heavy dose of Quaaludes ...