Falls on the Blacks

Advance, on the black keys, with the hand and the arm. Try to be in alignment with the finger that is playing. That is, in alignment with every small muscle of the fingers. Finger length is not the same for all of us. For example, with a short 5th [pinky], one needs to open the elbow a little more. In my opinion, it is better to play using a larger surface area of the fingertip.

Exactly right Paolo, but I also ask you if the tuning can many times influence "dirtying the notes".

I am trying to take part to answer you....

If we are talking about a very out-of-tune instrument, where perhaps in the chords there is a string that sounds a semitone lower, it seems obvious to me that this makes things sound muddy. Also in the context of excessively out-of-tune instruments, if we are very sensitive to tuning, yes, it can happen that one loses concentration because of a sound that we mentally expect to be different (in tune). I also wrote in another post that I recently played on a very old upright piano, tuned, yes, but a tone and a half lower. The harmonic ratios are always correct, even if a little slower than normal given the Hz defect, but the ear notices immediately. As soon as I placed my hands on the piano, I realized I was playing that Liebestraum by Liszt in another key. This disturbs the ear until one gets used to it and thus enters into the idea of the new key. It is obvious, however, that this causes quite a bit of distraction, especially if playing from memory, since one is often guided by the ear as well.

For pianos that are slightly out of tune, I believe the problem does not arise. Often we play with out-of-tune instruments and do not realize it, perhaps because since the last tuning we have played them every day and thus our ear has had the chance to get used to the gradual changes. Only by measuring with a tuning fork does one actually realize the difference. It is also worth considering that in terms of harmonic ratios, a piano, if perfectly tuned, remains so only for a few days, even just for a few hours, since there is always a minimum settling of the strings. The thing is imperceptible, okay, we are speaking strictly in mathematical, or rather physical... Regards

Hand position has nothing to do with tuning. You could draw the keyboard and study the movement of the hand. Aside from the lack of concentration that Simone speaks so well of, the problem lies in the position and the lack of confidence in "entering" the keyboard by moving forward and slightly raising the wrist. The movement is not the same for everyone. It depends on the shape of the fingers and the hand. The Maestro will supervise the correct movement or, rather, what the student MUST NOT do (It is not the same thing to suggest what one MUST do or to suggest what one MUST NOT do!!!)