Peter,
You mentioned you were listening to
Billy Preston on Hammond.
I have done a search on You tube (never heard of Billy Preston!) and have come up with the following (but not the hammond track you mentioned).
My Sweet Lord .. some superb guitar work.
http://uk.youtube.com/watch?v=VvH6fxP5hMoBilly Preston on Jools HollandYou Are So Beautifulhttp://uk.youtube.com/watch?v=oR7ZoC20WMM(I hadn't realised he had written this one)