John,
I couldn't agree more. Sunday Concert is essential to the collection. Like many of his albums I feel this one needs to be played whole to get the full effect. As for the other UA albums suffice to say that you really need to get them all and of course listen to them. Wherever a person started on Lightfoot, unless lucky like you from 1966, they have to go all the way back and all the way forward to get the full picture and sound that makes Lightfoot who he is today. I would rate Sunday Concert near the top for my "desert island" picks, LOL.
Bill