Many guitarists have favored drop D to add thickness to their riffs. The list would include Eddie Van Halen, Jimmy Page, Kurt Cobain, Kim Thayil, Jerry Cantrell, Dimebag Darrell, Tom Morello, Adam ...

When it comes to heavy, it's hard to beat the metal originators Black Sabbath. So we challenged Exodus and Slayer guitarist Gary Holt to lay down what he thought was the heaviest Sabbath riff. What ...