I'll take a look at some of the ones I haven't heard of. I have Pentangle albums, and I know Sandy Denny and John Renbourn. You need to give me some time, though, to listen to all the music you've suggested. I'm still working my way through the Bluegrass list. It's fun.
Any reaction to the Van Morrison post? Did you hear anything special in his voice that you hadn't heard before? I think a lot of people peg him as the Brown Eyed Girl commercial singer.