Hi Marty. Yeah, Spaw and Big daddy have eloquently explained the situation.I haven't seen Songcatcher yet, but I think I know what I'm in for, and will probably enjoy it without having false expectations.
Oh Brother was a disappointment to me, but only from the film editing and direction point of view. Had I not surrounded myself with trad music for over forty years, the soundtrack probably would have bowled me over, as it has for so many.
The John Cohen collection is, as the boys here have said, basically spontaneous recordings of folks that Cohen liked. Now HAD he thrown Dylan's (or even Doc's) name on the cover, in an attempt to sell a few more thousand copies, I'd be a tad more cynical, but it would still be a worthy collection for any traddie or newbie wanting to hear the "real" stuff.
It's a magnificent album. Grab one if you can.
Rick