JeffB - Ian Tyson's best-known work was from his days as the Ian of Ian and Sylvia. A lot of their work from the 60s is available on CD (and, no doubt, on YouTube). Some of his most-loved songs have been mentioned in this thread - Four Strong Winds, Summer Wages.

I'm not sure why LonesomeEJ mentioned Satisfied Mind - I don't think it was written by any of the three men under discussion.