MJR has offered some very interesting details of vocal technique. I've heard it explained several ways, but his red, blue explaintion is logical and correct.
NO, I am not a voice teacher, but certaintly work with and talk to some of the top vocalists and voice teachers in the business.
"Great singers never stop learning and training" that's pretty much true of many top notch singers. IE: I just covered Lea Salonga in Concert on Sunday. If you've ever heard her sing, you'd call her as "flawless" and "near perfect" as a voice can get.
Lea announced that she just went back to her vocal trainer who was "kicking her ass" with training, so that she can do a project in Manilla shortly.
However, someone like Linda Eder has had no substantial amount of training and admits it. She studied with two vocal teachers very briefly. I know one of them very well. He told me she came to him with that wondeful voice and that he could only adjust a few things technically and send her on way as a great singer. But this is a rarity.
I won't get into anything else about the business for it's really too complex. Just train to be your personal best and do it as "naturally" as you can. There's a big difference bwetween "acting" and "singing".
Sorry this got so long.
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BWW regional writer "Philadelphia/South Jersey"