here is the press release: http://www.mi6.co.uk/sections/articles/bond_21_artist_announced.php3?t=&s=

The Bond track, "You Know My Name," came as a surprise to fans -- and to Cornell himself. "I just got a call," he recalls, "and at first I thought there must be some kind of mistake." But after seeing the script and studying up on the new Bond actor, Daniel Craig, Cornell decided "I'm actually the right guy for the job. Everybody I met with said the same thing -- 'This isn't anything like any other James Bond film, so we don't really want that song, either. So go do whatever you want.'"

Cornell co-wrote "You Know My Name" with longtime Bond composer David Arnold and describes it as "more uptempo and a little more aggressive than any other Bond theme has been, maybe since Paul McCartney ['Live and Let Die']. It has an orchestra, but it also has some angry sounding guitar, and it's got feedback."