It’s a testament to the authenticity of the Scottish folk ethos that this band even exists. A bunch of mid-career songwriters going on a musicians' retreat, getting caught in the vibe, and deciding to form a band. It sounds like something from the Sixties. So sometimes do they, at least when Karine Polwart goes all Sandy Denny. And they half look it too, with eight of them on stage swapping vocal duties as a musical collective. And then there’s the hippy names like King Creosote and MC Soom T, which sound more jazz than folk. But despite being both experimental and folkie in their approach, their music is something else.