Heavy Rocks opens with fitting aplomb as a driving drum beat catapults a thunderous drop-tuned guitar riff headlong into the Sabbath meets Eddie Hazel pummeling of 'Riot Sugar' (featuring guest backup vocals by Ian Astbury). Boris' bristling thrash meets ethereal psychedelia ('GALAXIANS', 'Window Shopping') and lush, languorous nearly 13-minute songs 'Missing Pieces' and 'Aileron' navigate explosive quiet/loud dynamics with inventive use of song structure and emotionally-wrenching melody. Heavy Rocks is at once both a reinvention of Boris' magical ability to combine elements of myriad genres as much as it is a return to form, expanding and developing on the ideas explored on the original 2002 Heavy Rocks album. Boris invited some very, uh, heavy friends to contribute to songs the album, including longtime collaborator and Boris' touring second guitarist Michio Kurihara (Ghost), Ian Astbury (The Cult, BXI), Faith Coloccia (Mamiffer) and Aaron Turner (Isis, Mamiffer, et al.) It's worth noting that all of them tracked their parts in Tokyo, not via file transfer.