Interesting to see that he isn't as well known to folks on here.
Speaking as someone who great up in New England, I feel like I have been singing with or listening to David Coffin my whole life going back to when I was in the Revels children's chorus in Cambridge the 1980s, but also from all the various river sings, and other concerts and events that he has hosted over the years.
Fair to say that through his singing and playing he has exposed generations of New Englanders, to these musical traditions, and if you ever get a chance to go to see him perform at the Shalin Liu Performance Center in Rockport MA with the amazing window behind the stage overlooking the bay you will not regret it, as you can see from those videos that were posted here, it's a pretty spectacular space.