Three (Hundred and Sixty) Minute Hero(es)

Tracey and Gwyn met Khara at the Derby Summer Sessions at Markeaton Park. It's not unusual for us to volunteer. We were looking after the accessible area across the borderline, which was not too much pressure. The huge marquee was set up on the green green grass and the accessible area was in a corner, elevated above the capacity crowd: an area of dreams that wasn't out of reach. We didn't see an expected guide dog, not even a pussycat. The audience were mostly well behaved: just an occasional whisky drinking woman. We were there for six hours and heard some great artists. Can you work out who they were?