Another Friday, another pile of riffs — although this week someone appears to have turned the gain up considerably. The Riff Master himself, Tony Iommi, leads the charge with another glimpse of his forthcoming solo album, while Clutch return to the wastelands, Slash and Myles Kennedy fire up The Conspirators again, and Amon Amarth arrive just as The Allfather Awakens is unleashed upon the world. Here are some of the best new riffs landing in our speakers this week. Tony Iommi