After the surprising announcement that Mumford and Sons are going on an indefinite hiatus, frontman Marcus Mumford’s contribution to the Inside Llewyn Davis soundtrack has been revealed online. ‘Fare Thee Well (Dink’s Song)’ can be heard above, and to keep it short – it’s a nice song, a good collaboration between Oscar Isaac, who plays the lead role in the new Coen Brothers film. Not a big stray from what you’d get from Mumford and…