Following on the heels of my last two posts (one about how practice doesn't make perfect, another analyzing a recent Beethoven performance), it's worth noting one more thing:
All of our successes are a culmination of our entire lives up to that point, including successes and especially including our failures.
I mentioned in the Beethoven post that I'm quite terrified of performing fugues; that's a genre you can't get away from playing the piano. Here's the source of my terror: towards the end of my B.Mus in piano performance, I went through a string of performances where I had memory lapses in fugues. It didn't seem to matter what I did at the time, no matter how prepared I was, no matter how often I played without problems in the practice room, or for my teacher. I could not get through fugues.
Now, I know of several strategies to do better memorization work. The point here isn't how to do better practicing.
The point is that no matter how much better prepared I am today, I will still be worried about performing fugues in public. That makes every successful performance of a fugue that much more of an accomplishment. That makes every remembered note, every beautiful phrase or voicing that much more powerful to me. I think that playing on that knife’s edge allows me a certain kind of musicality that I wouldn't otherwise have. I would play differently if I didn't have that string of rough performances. Not better or worse, just differently.
The “failures” of my past make me, me, the pianist that I am today. That's the most valuable, distinctive, tool in my musical arsenal.
"Modern performers seem to regard their performances as texts rather than acts, and to prepare for them with the same goal as present-day textual editors: to clear away accretions. Not that this is not a laudable and necessary step; but what is an ultimate step for an editor should be only a first step for a performer, as the very temporal relationship between the functions of editing and performing already suggests." -Richard Taruskin, Text and Act