tompilk, I agree with Stevie - the Godowsky was probably not quite worth the effort in Horowitz' mind to devote the time and effort required to play it effectively.
i would say that most alkan is harder... and some liszt is...Tom
The craze was not about listening to Horowitz - it was just about imitating him.
I suspect this thread was started by someone young, for whom Horowitz is just a name. Better that such people just "butt out." They really have no bona fide interest in Horowitz. He is back in the past somewhere like for their great grandfather.For those of us whose lifeline paralleled Horowitz, it was different. He was a living genius, and a superb pianist. In my lifetime, Artur Rubinstein was another -- very different from Horowitz, but a candidate for "best of the century."