Jazz vocalists which may not be as real as we think/imagine


Sure we could include all genres of vocalists,  but lets focus on jazz performers,,for instance , take Diana Krall. 
I have a  pile of cds that i do not listen to, old rock,,, 2 are my wife's she picked up as gifts, and never listened.
So I figured maybe I can use DK's as a  test reference recording.
Her 1999 and 2001, both seem to my ears her voice is somehow ~~tweeked~~ laid out with modern aids such as EQ's and such.
My Q is , can we really consider DK's voice to be The Real Deal,,, or a  perhaps a toch of  ~ The Fake if not perhaps, bordering on, fraud. 
I really can not use her cds in my testing of new tweeks, mods, , Her voice comes across wayyyy too warm = Colored = a nono for my ears. 
I am after pure cold frigid, icy clean mountain spring water. 
Anyway, justa  random thought,, what say ye? Have you noticed this quirk among other jazz performers such as Sophie Milman, which btw , i do use in  my YT vid uploads of testing reference on tweeks/mods/upgrades. 
Her voice is at least somewhat more~~ a  natural~, Just barely,,had her engineers gonea  tad too far in tweeking, I may have to  also disreagrd her cds. 
Sure you might object and claim all recordings post 1985, have these intrusions of tweeking /EQing the voice, as a  makeover. 
I don't know, maybe in the past 20 yrs things have gotten out of hand. 
So cast your vote, is DK's voice real deal,, or a  tad fake?
Can she perform unpluged as she does on high tech studio records?
mozartfan
OP
Try listening to Julie London, pop/ jazz singer from 50’s 60’s esp sultry “cry me a river”.
Just sit back, close your eyes and listen, deep in the ears...
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cd318 -- I actually got a tour of those Capitol Records' subterranean echo facilities.   It was sometime in the 1970's.  The drummer in our rock band wrote publicity for Capitol and had an office in the famous tower.  The office was tiny but he did have a view of the Hollywood Hills.  Anyway, knowing that they weren't in use he took me down there.  Yeah, I was impressed. 
Are we talking about autotune?

Yeah something like that,, but obviously her record studio has alot more high tech gadgets tahn just the old autotune.

It's statements like this that show the OP really don't know what he's talking about.  A simple internet search brings up information that indicate there is minimal "processing" of her vocals.  It's also easy to find live concert footage of her performances, for instance the NPR material, to use as a reference.
Heard her live a couple of times good as Gold.
You can count on most studio recordings to be tweaked including those that are mixed down after live performances. Her genre is bordering on Jazz Vocals and Pop. Whatever she is doing good for her and good for our Agon community.   
A few years back my Wife and I went out for dinner and hopefully a good jazz performance at the Jazz Corner in Hilton Head. If you have never been you need to go! Anyway Sachal Vasandani was doing a one night performance as he just got back from a two week tour in China. Wow what an evening!  Hey the dinner was amazing also