If you can read notation, it might be worth going to the source and buying the Briggs instructional manual. We were given a few songs with both tab and notation on the same page and I could scan these and email them to you, if you like.
I understand. After 2 years of tenor banjo, I'm just now finding the 5 string fretless. I am not where near where I want to be. What you hear on the recording is my style. It is guitar picking and sparse. But I love it. Jimmy Strothers is my chief influence. I nearly cried when I heard his playing. When I can figure out how to post his music, I will. Let me know what you think of his music.