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twocats I don't think you reached the stage where the piece became a part of you! First, it has to be completely solid. And then the memorization has to be completely solid. I think my friend means that you have to be able to lose yourself in the music, and having your eyes open and tracking the music doesn't let you do that.
- If one has learned a piece well but not fully memorized it, then at that stage one is usually not doing what I would call tracking the musical score. Before playing from memory became popular or even required, do you think keyboard players were not capable of losing themselves in the music(whatever that means) or had some expressive limitations? Do you think orchestral musicians or chamber music players of today lose something in their performances because they are playing with the score?
- If one is playing from memory then one's eyes are usually still open but focused mostly on the keyboard.
If someone has put in all the time usually needed to solidly memorize a piece AND Is has no fear of a memory lapse (rare), than I wouldn't be surprised if all that extra time with a piece improved their performance. But is it really worth it except possibly just occasionally considering all the downsides of memorization?