Bjork’s collaboration with Radiohead’s Thom Yorke, “Nattura,” has been described by the Icelandic singer as “a protest and a rallying cry” in honor of efforts to save Iceland’s environment. (I guess the banks can wait.) The rapidfire drums and chant-like vocals would seem to bear that out; this may be the first time that I’ve ever felt the impulse to bang my head to a Bjork song. Yorke, meanwhile, provides some moans that are turned into huge sound waves that wrap around the proceedings Christo-style, and somehow provide even more urgency. [YouTube via Pitchfork]