James Blake & Bon Iver. According to a press release, "Over the past year James has cited Justin as a key influence and it was via a chance meeting at this years SXSW festival in Austin, Texas that the seed was sown for a future collaboration." The track was "formed in the spring over email." It features Justin Vernon on vocals and James Blake on production. It will be available on iTunes on August 29. Read more on Last.fm.