You saw Bon Iver debut this cover on Fallon last month and then heard a studio recording as the b-side to "Calgary" last week. Now here's a live take of Justin Vernon alone with his hat and piano performing the Bonnie Raitt classic(s). Budding Bruce Hornsbys will be pleased with all the close-ups of his fingers. [videoembed size="full_width" alignment="center"][/videoembed] Bon ...