Undisputed masters of murderous riffs, pugnacious grooves and ferocious hooks since 1991, Machine Head are long established as one of the most influential and incendiary bands in the metal world. From genre-expanding triumphs like 1994's debut, Burn My Eyes, 1999's The Burning Red to the planet-conquering might of 2007's The Blackening, to the new life injected in 2014's Bloodstone and...