This is a time capsule of a harder era in rock music when there were no other bands to compare against. These guys were the original heavy metal rockers. Amps and PA's were pretty basic and BIG. Anything they tried was brand new and to some of the critics somewhat radical. But they were good and because they kept their makeup simple- (2 guitarists, a drummer and a very wild front man) they were able to duplicate their studio sessions in live performances that set crowd attendance records wherever they went. This was never more evident than on this DVD in the live performance of Children of The Grave during an American tour. Equipment loaned, music honed, band stoned - Black Sabbath in full cry, pure magic. They also became masters of the tempo change like in this performance of War Pigs. I hasten to add that in this song, Ozzie crosses over lyrics between 2 versions of this song, I'm not sure he even knew which one he was singing! If the head bangers of today want to see the birth of heavy metal, look no further than these guys. Raw rock at its best.