Machine HeadBloodstone & Diamonds

★★☆☆ This album starts out sounding like an amalgam of a few hallmark Machine Head albums (“Burn My Eyes,” “The Blackening”), Metallica’s black album, and latter-day Slipknot. And Hans Zimmer’s “Inception” soundtrack. And maybe a little Pink Floyd by way of Queensrÿche. Welcome to Robb Flynn’s continuing efforts to take the high road (or at least as high a road as you’re gonna find in the East Bay).