I didn’t find the singing particularly objectionable. Think of the versions of both “I am the Cosmos” and “You and Your Sister” I rejected because the singing or choice of chord progression were imperfect. Hell, of the five cover versions in the post you referenced, this was about the most accurate representation of the source material. I picked it over Little Miss Three-Nipples, after all.
American Shad 
I quite enjoyed that. His singing is perfectly lovely (albeit a bit flat)as is his whistling.Cool guitar, too.
I didn’t find the singing particularly objectionable. Think of the versions of both “I am the Cosmos” and “You and Your Sister” I rejected because the singing or choice of chord progression were imperfect. Hell, of the five cover versions in the post you referenced, this was about the most accurate representation of the source material. I picked it over Little Miss Three-Nipples, after all.