Transcendental performances? I can think of two straight away.Firstly, Emmylou Harris in the Usher Hall, Edinburgh in 1975 (or 1974). I had seen her debut British performance in the Hammersmith Odeon a year earlier, wnich was really good, but in Edinburgh she was pure unadulterated magic.
The other unforgettable performance was David Bromberg at Cambridge Folk Festival, 1975 or 1976. Has there ever been a better performer?
Murray