My sneaking feeling is that the theorists overcomplicate - but of course I may well be wrong. Also I know some singers who appear to have benefitted from voice coaching, but I know of others who have been deprived of their natural sound by attempts to clone stage musical singers (see post some way above as a truly dreadful example, musical directors like that should be be taken out and castrated with garden shears, slowly).

I would suggest, Guru, that you don't do it. What you do is great.