Led Zeppelin vs. Black Sabbath

When it comes to metal forefathers, no other bands can touch these two: They subjected rock to high-decibel tonnage like nobody before, performing black masses at the altar of mighty riffs and bulldozer rhythm. Zeppelin recorded first, and relied more on speed, swing and epic Stonehenge majesty. But Sabbath were more insistent on abandoning boogie blues for the sound of your most evil nightmares.