Once impressively prolific, new music by Sufjan Stevens comes along at a much slower pace these days, so the anticipation for tonight’s show, the first of two sold out shows at The Helix and the opening date his European tour, has been building for a while. After an support set from bluesy mother and son duo Madisen Ward and the Mama Bear, Sufjan and his unassuming looking band take to the stage, and it’s immediately clear that we’re in for a very different show from when he last visited these shores four years ago. For a start, we’re all seated,…