I was just reminded by Ed (Pee Wee) that he backed Ian on the Ian Tyson Show (1971-1975) with the band The Great Speckled Bird and Sylvia..
http://www.thecoolgroove.com/ian_tyson_show.html - every show had a message from Ian about the environment—a reminder to the viewers to take care of their world in some specific way.
http://archives.cbc.ca/society/celeb...s/clips/12016/