http://jethrotull.com/glenn-cornick-290814/
Stand Up and Benefit were two favorites of the time. When I saw Tull, it was the Aqualung tour; but I also saw Wild Turkey around the same time.
Here is Nothing Is Easy (https://www.youtube.com/watch?v=axEK3x5KIYc) from Stand Up, live at Isle of Wight in 1970.
Great link Dave.
RIP Glenn.