meself, its not to do with style it is to do with breathing and treating the voice with respect so that it lasts longer, you can have opera training but not sound like an opera singer,any singer that has suffered from voice problems because they were singing with bad technique will endorse my comment. hank williams did not live very long so the abuse his body received did not hyav e time to affect his voice howling wolf had a good technique anyway[ that is evident from smoke stack lightning, your comment is uninformed