See an article I wrote about Sid on www.hillbilly-music.com (search his name there) ...
Presently, several (late 70's) performances of him are to-be heard in my AUDIO BOOK/FOLK MUSICAL, "THE CAROL and the True Folk Legend of Jack Frost" (search it on Aubile.com (Amazon, etc., etc.).. and a Double-CD SOUNDTRACK is planned for release by Fall of 2011.