A performance together at the Rock Hall Of Fame anniversary concerts in New York two years ago led to discussions between Lou Reed and members of Metallica about working together on an album. Reed set about writing songs for the project, with Metallica contributing arrangement ideas.  The 10 tracks on the album, which is due out October 31st overseas and the following day in North America, includes a 7+ minute lead track title Pumping Blood. 
Reed has gone through some extremely high decibel phases in his career, including the mid 70's, when he put out a Richter Scale jarring album titled Metal Machine Music (1975).  He calls the work he has done with Metallica 'awe-inspiring'.  We can buy that, but he lost us when he went on to call it '...maybe the best thing done by anyone, ever', and added, 'It could create another planetary system. I'm not joking, and I'm not being egotistical.'
NYMag.com  ConsequenceOfSound.com