If you, for one reason or the other, have not heard the album "Matching Mole" fom 1972, please do. Right now!
On that album you will find one of the best songs to come out of Canterbury, "O Caroline", written by David Sinclair and Robert Wyatt.
Then check out the cover version sung by Brad Scott, on an album called "Garden Parti & Caroline, Yes!" (Zig-Zag Territories, 2011). Quite nice..
As you see (if you followed the link) you may buy it over at Zig-Zag, but it´s also on eMusic and iTunes.