I have read the book ( I also love Elijah Wald's book about Josh White) but had forgot that story. I'm not sure DVR was really what you classify as an unsuccessful folksinger - certainly not at that point. He had options, and he wasn't destitute.

Actually it was a bit weird hearing Dave when the final credits rolled. After the dulcet tones of Llewyn Davis. I don't think you would really confuse the two.