Bruce Langhorn used to do amazing little pull-off trills. Probably the best example is in his backup of Tom Rush on Urge For Goin', but you can hear them in some of the stuff he did behind Odetta, too.

And I don't know off-hand who the guitarist was, but somebody does a series of key-changing runs on Ian Tyson's version of Sierre Peaks that just blows my mind every time I hear them. I thought Ian might have done the picking himself, but he took a by on it when I requested it during a concert a few years ago, so I suspect it wasn't him.

david