I'm 64 years old. EDIT: Thinking about this, why would it have any bearing on this question since I said living?
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As far as using the word, I'd say it fits Horowitz like a glove:
om·nip·o·tent
ˌämˈnipəd(ə)nt/
adjective
adjective: omnipotent
1.
(of a deity) having unlimited power; able to do anything.
synonyms: all-powerful, almighty, supreme, preeminent, most high; More
invincible, unconquerable
"the worship of omnipotent deities"
having ultimate power and influence.
"an omnipotent sovereign"
noun
noun: omnipotent; plural noun: omnipotents
1.
God.
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EDIT: COMMENT on POPULARITY
What I'm not after is P, but genuine mastery of the craft. It is sad to hear what simply have to be lay people, who truly love Horowiz, but are not able enough to hear wrong notes. This gets even murkier when it comes to interpretations: Lang Lang is a perfect example and I'll leave this comment at that.
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It is interesting that someone brought up Liberace. Interesting because Lib vs H is exactly that what I was trying to get at - can you believe Ricki Scaggs opening for The Dixie Chics? Popular in many cases has nothing to do with "omnipotence."
I've watched L play with great scrutiny as well as H and will leave it at L was P and H was O.
Which brings me to LL. Oh yes, he is P (definitely a Rock Star) and while I've never made the association, he is definitely playing the Liberace-card - albeit a strict classical one.
But LL is definitely not a "god." H was God.
So that leaves Martha. And perhaps Yuja to emerge as the next torch bearer in years to come.
Pollini is a mention, but one of the credentials of this position, God that is, is a monumental repertoire - which Yuja is in good standing.
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I put H on the Throne, then Rachmaninov, then Rubenstein and Cliburn but now the vacuum is deafening.
So that leaves Martha.
But who am I missing or over looking?
NOTE: also Titan might be a better word that God, but that is moot.
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EDIT: REGARDING CZIFFRA:
When it comes to Liszt The Juggernaut, Cziffra stands unchallenged. His Grand Galop Chromatique is a marvel of Human Accomplishment, played at break neck speed he still shows bursts of even more speed with perfection and strength. And his Flight of the Bumblebee of course. But then his Heroic is stillborn compared to the Young Rubenstein's. And how big was his repertoire, was it limited? Cziffra in his element is Supreme and for that, he must be recognized and mentioned when any list of all-time-masters is compiled. NOTE: People have commented that his life was most difficult and that it is a marvel in itself, that he accomplished what he did.