Chopin's C Minor Prelude is as mighty a composition as Rachmaninoff's Prelude in C sharp Minor with the "fffff" and there is no reason why it should not be as loud.
False... if it was meant to be fffff, then Chopin would have written fffff in. Rachmaninoff wrote fffff explicity the Prelude to try and stress that he didn't want it to just be very loud (as in the opening of Chopin), he wanted it very loud, broad in sound and projected. If he wanted it to be as loud as Chopins Prelude, he would have simply put ff.
I'm amazed you seem to think the 2 signs are interchangeable... because that's simply wrong.
About how the 19th century pianists played, I don't think there is much point in us discussing it when your position is one of "my mind is made up, don't bother me with the facts".
Again, you seem to be mis-interpreting me. My convictions are the way they are, because I know the facts. Granted I won't say I know them all (as you seem to think you do), but your assumption that ff and fffff as above as being interchangeable (only 1 example), is just wrong... so I would check
your facts, if I were you. I'm happy to talk about proper musical appreciation, technique and pianism, when you stop saying ridiculous things like you're the only one to hear the music of Liszt. The type of people who usually have that sort of ego and make those sorts of statements have something mentally wrong with them, as of course there is no credible proof for them to back their claims.
For you to say that you know what Bach's keyboard tempos were or were not is false.
First of all, we have a good idea on what they were. The use of tempo markings written from the early 1700's give us a good estimation of the intended speed. Although no specific metronome markings are given, there is a clear difference between playing a piece that's Andante at 70-80bpm; than at say 16bpm. You need to stop mis-interpreting what I say and trying to twist it.
You've taken excessively massive liberties for the music, to the point of just being stupid for the sake of being stupid (or different)... either way, it doesn't work. Many people have discussed their horror at hearing your interpretations in most of your recordings, so if you want to play it how you like in your own home - you have the privilege. If you want to join a piano board, where serious musicians and pianists reside and frequent - you're going to have to do it properly, with thought, conviction and authenticity.
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Although I'm pretty sure I've made my view clear, I feel that trying to argue with someone who is incapable of reason or understanding (like yourself) is probably a waste of time, primarily because you seem unwanting in trying to better your technique and understanding of the music of the great composers and how to interpret it. You can take massive liberties if you want and bugger it up any way you want, and I shall continue learning, researching and playing the pieces with the composers intentions.
...get on the boat now before it is cut loose from the pier. Because once it gets moving, if you aren't on it, you aren't going to be able to catch up and get on.
I suspect you will be the only person standing on said boat... drifting into the open waters, possibly never to be seen again.

Make sure you bring a life-jacket...