Typically playing is worse during performance than practice, so if you want your performance 100 percent, get it to 200 percent...
That depends on the person. When the pressure is on some ppl do worse while others thrive. That’s an uncontrollable variable.
There is an interesting psychological phenomenon that has been researched, where people who are genuinely confident at doing something do even better with some pressure/nerves on them, whereas people who lack confidence do worse. Can't remember what it's called. But it correlates with my piano skills deteriorating in front of scrutinizing colleagues, and me often playing way better in front of an appreciative audience
Interesting you mention that. I was watching #thepianist and the coaches (Lang Lang and Mika) and host Claudia Winkman used a setup where street pianist were playing naturally and were not aware they were being watched. The coaches didn't want their players to know they were watching to see how they performed. Then for the finale four chosen contestants had to perform on the stage. You can see how nervous they were. And they all did well.I also prefer not being scrutinized by peers or experts. It works against me. I'll admit I'm just ok. I think the universal answer is the degree to which pressure gets to you. Some pressure is necessary for the person to do better. But there is also the point above which becomes counterproductive. I tend to picture the pressure to be like rowing on a canoe with two oars. If you use too much force the canoe doesn't go any faster. But there is a maximum force to be used that will bring you to an optimum speed. The canoe just can't go any faster with more force. The pressure has to be within our ability to overcome. Too much and we break. If we are within grasp of beating it that's the right amount of pressure to be had. In a way you have to bring 80% of the skills. To get to the 100%, I feel at that point it's not the physical practice anymore but the mental. You are as good as your thoughts. If you want to fix something you have to focus on tweaking the mind. Then the fingers will follow.
This post is from Dec '22 with the latest response in April '23. The poster has surely performed his 3 pieces (it would be interesting to know how it went), but I comment because this is one of those forever topics for musicians...And it's a main interest/focus of mine. It seems many amateur/student pianists get pieces to about 75%-80% but that last 20% is like impossible. I, for one, was never taught how to "get a piece to performance level". I think the pedagogical assumption is: you practice til you're there. But I think a more mindful, intentional approach is more effective.The tactic that has made all the difference for me, and that no one has mentioned yet: Recording. Doing a recording simulates a performance. It's one run through and the goal is "my best" (whatever that means to you). Recording has really shown me where my weak spots are - both technically and artistically. I typically go through 3 recording sessions (maybe a week apart) for a piece before I get the one I'm happy with. At that point I'm much better prepared to perform the piece live.Prior to recording comes another step - Memorization - the goal here is not necessarily to have it perfectly memorized, but the tasks of memorization bring the musician deeper into the piece - you have to analyze the piece to memorize it, so you understand it's compositional structure better. And by getting away from the printed page, looking at the keyboard, you can focus more on sound. Some are excellent sight readers - they can read the music and play it at their best level, but I'm not one of those people.