On every singing competition I’ve watched, contestants who sing songs using a blues-inflected voice are invariably complimented by the judges. I’ve never heard anyone sound bad doing this.
I have even taken advantage of this at karaoke nights. I tried a couple of songs in my regular style (I’d say I’m an average singer), and also a couple of songs in a much more bluesy style (both Springsteen songs, but I was definitely singing them with a blues inflection). Both times the songs were much better received than the regular songs. Now it could just be that I’m a much better singer in that style, but again I’ve never seen a judge dislike a bluesy song.
Do the blues make most (if not all) singers sound better for some reason? Does that raspiness send off some unconscious (perhaps sexual) cues to the listener? Has anyone ever heard the equivalent of a William Hung in that style?