He wrote Poncho and Lefty for one. He wrote a few other songs that were picked up by bigger singers. He was a well known Blues and Folk singer albeit more or less on a very underground level I guess. Guy used to huff glue through a sock in his mouth as he slept. He was a huge alcoholic, at one point he was shooting up burban and coke with his girlfriend soon to be wife according to witnesses.
While his actual singing leaves something to be desired he actually wrote some good sogs. Waiting To Die was a cool song for the genre he was in.
If interested you can go to Hulu under movies and do a search on him to watch the documentary.