(L)"Maybe you are not familiar enough that is why they continue to be least confident with. If you are familiar with them this means you have had a lot of experience playing counterpoint and patterns you face when sight reading will be easily executed and inferred, you will understand what you hear and anticipate the changes, the reading will be more easy and fluent, the fingerings are well known."
(N)I've learned more than half of book one of wtc to a standard of accuracy. I suspect that plenty of pianists who have done it all would still struggle to do fugues of the same standard.
(L)I play all 48 preludes and fugues and they became easier and easier to sight read the more of them I learned and the more of Bachs music that I played as a whole. Put a new fugue in front of me and I can play all the notes with good fingerings no problems, if it is a rapid tempo then of course you can't rattle it off at speed instantly but that is irrelevant because from slow and controlled playing comes any speed.
(N)By your logic, having learned the complete transcendental etudes should make la campanella feasible sightreading.
(L) You can sight read first go it with the correct fingerings perhaps at half tempo no worries.
(N) It becomes easier to learn fast when you know the techniques. But not to process enough information to do it straight off first time, simply because you processed a lot of information before at your own leisure. Sight reading starts with reading information rapidly and accurately.
(L) You are misunderstanding how sight reading is used. We don't just read it 1 time and expect to play it at tempo perfectly. But I can sight read it 100 times in a day and get it solved, rather than a memoriser who has to spend weeks analyzing their fingerings, notes etc etc. Sight reading, do you really know what is used for

(N)All too many pianists forget that. The reading side doesn't automatically become great either by ploughing through loads of material once or by learning loads of repertoire in your own time- unless you are doing both in the right kind of way.
(L) If you actually did read through a lot of music you would realize that it helps you to read the generali procedures there is in musical writing. There is no magical "right kind of way" you are trying to say again with ZERO clarification as to what this right kind of way is lol. You will simply be able to read better and faster and more accurate the more you read. There are of course structured ways to improve your sight reading, but simply reading a lot of music will help AUTOMATICALLY.
(N)It's no different to the fact that some pianists who practise hours per day are still rubbish. Quantity doesn't always make for quality.
(L)If everyone who practices does so in a wrong fashion then of course they are not going to get better. But the reality is that most people who practice will see improvement, there is only a small portion of people who practice completely wrong and this can be easily remedied with a good teacher. No practice is worse than bad practice.
(L)Put an expert in Bach into a totally different style they will most likely fall flat on their face. Try to sight read some Kasputin or perhaps with other rhythmic music which Bach does not explore. It will be terribly difficult. But put a stride pianist in front of some Kasputin and much of what is read might be easily understood because of their experience base."
(N)So anyone who has played enough kapustin should be sightreading anything else by him?
(L) Yes, but someone who plays a lot of Kasputin would play a lot of other styles which are similar from other composers. There is a network of knowledge that will allow you to read a particular style fluently. Playing 5 of his pieces is not a lot.... Sightreading through all his works and you will see his overall style. Read through other composers as well and you will see similiarities and contrasts between different people.
(L)"What about a style which is full of procedure you are unfamiliar with? Saying you have no problems with ANY STYLE is rather over confident, and ridiculous."
(N)Why? I have played very little jazz. I read through numerous Keith jarrett transcriptions fine at first sight. However, I cannot do so easily ones involving elaborate passage work. Not because I don't know the style (because I sure don't have experience of the harmonically dense and chromatic style in the ones I read fine) but because it's too much information to process to rattle it off right there.
(L) Maybe not on your first read but what about those that follow? How fast does it improve?
(N) Difficulty is what limits people with a broad skill set, not style. Good tools don't stop working on specific musical styles.
(L) A style can be difficult because of its style.... If you haven't read the procedure enough then you are not familiar enough with it. difficulty may slow the tempo of your playing while sight reading but it is irrelevant because from controlled playing comes any tempo.
(L)"Whatever "slender handful of respects" you mean you have obviously skipped over with no explanation. If I have memorized one thousand pieces you think this will not help reading difficult works?"
(N)That depends whether you got better at processing information by sight better.
(L) Learning thousands of pieces does nothing at all? You think there could be even a chance that it does nothing? AHAHAHAHAHAH
(L)"When you stop and keep trying to work out the fingering then you are playing music with content you have little experience with, you can only produce the fingerings instantly without having to stop and decode it beforehand because you are drawing from experiences from many many pieces and the procedure is well known because of that!
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(N)If you're not good at finding effective fingerings with time to think, there's slender chance under pressure. I learned the processes of how to finger counterpoint better in freer time.
(L) This means you can't sight read the works because you are still studying them to become familiar with them. The fingering is not automatically understood because you haven't gone through the procedure countless times.
(N) But it's not memories in reading so much as transferable skills in executions.
(L) If there is no memory in the reading then how do you see a group of notes and react to it immediately without having seen it before? You must remember the pattern, at first the memory is raw conscious observation, later it becomes an instant muscular reaction in the fingers to what the eyes see.
(L)"You haven't explained yourself at all. What does more adept at figuring out what the score asks for.......visualise at once" mean? It is meaningless without any elaboration. Explain this with zero connection with piece memory or experience because you have already said they do not contribute a great deal at all to sight reading. Go on, please tell us what this "figuring out" and "visualise" is all about."
(N)I suggest you read the Karl Leimer book that Gieseking was associated with.
(L) AHHAHAHAHAAHAH... wait? HAHAHA... please. If you cant explain yourself don't throw boooks at me.