John. When you think about it, there are many awful songs made good by a bloody good artiste. The proof of the pudding being hearing them sung in not so good a manner. A good song might survive the croak, but a bad song shows its true colours.

All points in between. There are some songs I would love to sing but found I am not good enough to sing them well enough make them entertaining for a discerning audience. Some because of the vocal range in the tune, some because try as I might, even a complicated guitar style with a good riff can't polish a turd. (Carthy has made a living out of this method. If a traditional song has a snazzy guitar intro, the song needs it. King John being an excellent example.)