Sorry Dick - self recommendation is never a reliable guide to someone's abilities.
You are right - I have never met you - all I have to go on is what you contribute to this forum, and your persistent arrogant rudeness, hectoring, bullying, and insults scream out (to me at least) that this is not what I would look for or expect in a 'teacher' (not since they closed down the old Irish Industrial schools because of what went on there).
Your facile suggestions of "3 different interpretations" or "teach them how to interpret a song to bring out the story" goes against everything I was part of for 20 years.
Every singer is different and every problem those singers have is unique to those individual singers, and to produce a cure-all 'scribbled on the back of an envelope' solution to all ills just doesn't hack it.
A singer must make his/her own decision on interpretation, based on the text and on their own personal take on that text.
Each singer's own problems have to be dealt with as just that - individual, unique problems.
That cannot be quick-fix 'taught', you can only work on what a singer has already done and help (help only - not teach) them to build on that.
Even raw beginners have done some work and reached some conclusions on what they want to achieve.
Nobody has the right or the ability to impose styles and interpretations, or even restrict the number of interpretations to three or however many - that is the most personal and in many ways the most enjoyable part of singing - expressing your own feelings and emotions through song - that can never be 'taught'.
In my opinion, the very first thing you need to do with new singers is to encourage them to listen to our source singers, particularly the best of them - if anybody has a claim to be 'teachers' it is the people who have kept them alive and passed them on for generations, centuries even.
Your record on source singers doesn't particularly commend you as a good 'teacher' I'm afraid.
'Tone deafness' is a fairly rare medical condition which very seldom surfaces in wannabe singers (certainly not in my experience) - I doubt if it can be cured or even commented on by amateurs like ourselves.
It is often mistaken for unfamiliarity with the act of singing and sometimes used to dismiss prospective singers as no-hopers - as you appear to have done here by relegating them to no more than opinion givers.
"THE VERY occasional visit YOU MAKE to England and are classic cases of generalising from the particular."   
I get more than a little tired of arguments like these - you are the one of two people on this forum who use it instead of argument in discussions.
I don't attend English clubs as often as I did or as often as I want to - that in no way excludes me from holding or expressing an opinion on what goes on there.
I have some idea of the pertaining state of things: from the web, from what singers like you put up on U-tube, from discussions on Mudcat, from magazine articles, from regular visits of English singers to festivals and singing week-ends over here, from constant contact with friends on the scene.... far more than I ever did when I was attending the handful of clubs I did when I was living in the UK.
Added to which, the four decades I was involved in the English scene is enough to persuade me that things haven't changed for the better and a significant number of people still involved agree with that.
If your ill-mannered and dismissive behaviour on this forum is anything to go by I am glad to be able to view the scene from a distance where I can put the occasional self-promoting arrogance and seemingly built in corpse-kicking into perspective.
"DO YOU UNDERSTAND WHAT I'M SAYING DICK"               
Jim Carroll