Buffy Sainte-Marie. Dylan, though he's surprised me lately with songs like 'Hard Times' - his is now one of my favourite versions! Cara Dillon, much of Sandy Denny, Martin Carthy, and Woody Guthrie.

This, as someone said before, has more to do with my own taste than the artists mentioned. There certainly are artists whose music I think is simply of poor quality, but this isn't that list!