Bon Iver‘s Justin Vernon has previewed a new song which features Taylor Swift – you can listen to the snippet of the track, believed to be by Vernon’s side project Big Red Machine, below.Vernon worked with Swift on her recent albums ‘Folklore’ and ‘Evermore’, both of which were released last year.While broadcasting on Instagram Live yesterday (April 13), Vernon shared a brief audio clip of an unreleased song featuring Swift’s vocals.“That’s the awesome Taylor one.