In his "Where Have all the Flowers Gone" Pete Seeger says that the Rev. Charles Tindley's "I'll Overcome Someday" may.... or may not have come first. It is dated 1903. This book contains words and music. I can do words later... music would have to wait for more gifted hands!
Also, Pete's book is dated 1993. Any new scholarship since then?
Having sung the current version more than a little yesterday :) I'm just glad it's around in ANY form. It's good for what ails ya.