They give the songs a real kick in the teeth with the heavy metal sound updated, then add horns and percussion to make it really push. Sometimes it sounds like a Crimsonian Sabbath reading of "20th Century Schizoid Man" in a funny way. Other times it just sounds vital and fresh. And that's plenty good enough!
The singing is Sabbath-worthy. And face it, early Sabbath did something to metal that it never recovered from--and set the pace for less worthy bands to follow, and some worthy ones too.
This album is a kick! You'll be surprised, then happy to hear the care with which they recreate the tunes anew. Seriously.