The Wilsons are a group. A family, even. Unaccompanied harmony singers.

My daughter (Edain) went to Warwick a few years ago, her first unaccompanied festival. She rang us up late Saturday night. Are you well, we asked. Oh yes, I'm listening to the Wilsons in the late night concert. Shocked parents: you aren't using your mobile in the concert hall? Disdainful pause. No, I'm in my tent at the campsite. But I'm listening to the Wilsons in the late night concert.