as a Professional Musician?

As a professional musician, have you ever forgotten a piece of music you once knew to performance standard?

I'm not a professional musician but I play piano and have learned piano for a good number of years. Having a teacher for years (I've had 3) means I learn a lot from their perspectives so what I'm sharing are my observations. My teachers are all Russian- and Ukrainian-educated (Tchaikovsky, Odessa, you name it) and extremely conservative on music, so you can guess, t find popular music distasteful and a waste of their time. My education has been thoroughly classical; all of my texts are written in either Russian or German. I once suggested one of them if he could instruct me through a hard part from a movie soundtrack. He kindly did so but then said such pieces were not meant for serious study of piano and not worthy of my time. The other teacher was a critic herself and during my first years of piano she kept me from the "elevator music" type, like Richard Clayderman, Yanni, Yiruma. I always wondered why until later into my teens when I got exposed to various music genres. I became tremendously grateful that she tried to keep my taste as classical as possible so my experience with art music does not get diluted with mediocrity and I can become more critical of the sound I hear. Now I consider myself a more eclectic listener - experiment and can appreciate a wide range of genres - but I never lose my enthusiasm for classical music, year after year after year.