Oh Fairport Convention...now I'm all damp.
Your favourite/the best ever SUPERGROUP - Page 2
While I'd never discourage anyone from discussing Fairport or Martyn, they seem more wedded to Western folk/pop song structure than is typical for what I think of from "prog" bands.
The mention of Fairport, though, does give me an excuse to cite another of my favorite "supergroups":
And if someone does start up the prog thread, put me down for Quiet Sun and Secret Chiefs 3.