Then, suddenly, there’s a portentous sound swelling from behind the sheet, which then drops. As it does, the figure in front of it removes the sack, revealing himself as Butler, and all hell breaks loose both onstage and off. Over the course of 45 minutes, the room is a revolution – We’re Coming In, (The First Stone) Changes and Hunting Season hurl themselves around the room as every mouth in the room shouts back their radical and rebellious words, and you feel, whether during the songs or one of Butler’s many speeches, that this could actually, genuinely be the start of a political movement.