After many years of ineptitude, I can usually work out a usable set of chords, but it's a real pleasure when someone far more capable than me points me in the direction of something more obscure than I would have found for mysef. To take a couple of examples from someone not usually considered a complex musician, 'Boots of Spanish Leather' in G is transformed by an Em9, and 'When the Deal Goes Down' in C has a nice-sounding G11 (all subject to the vagaries of my memory) - I can't imagine how long it would have taken me to find those. Actually, I probably wouldn't even have bothered as both songs can be done using straightforward chords, but they lose a lot.

So thanks to everyone who responds to a request for chords, from those of us who can't.