Bon Iver first tried working with voices only, after Sean had talked about Grizzly Bear’s Take Away Show, about their a cappella performance of "Knife" in the streets. Justin asked his two pals to try the same thing on "For Emma". A ritornello on two octaves for Sean and Mike, accompanied by snapping for the rhythm: that would be just enough... takeawayshows.com blogotheque.net/Bon-Iver,4255