Yeah, he's a really funny guy.
A kid from a local band was sitting in the front row and he had a sign round his neck saying "Please let me play guitar with you". Chris had spotted him outside earlier in the day, and actually got him up on stage to play on 'Doesn't Remind Me' and 'Fell On Black Days', occasionally stopping playing himself so it was just the kid. Very cool.
I think given that the first 'Songbook' CD was subtitled "Vol. 1", there'll definitely be another one, containing a bunch of songs not on the first one.