About 25-30 years ago, I was very serious about piano and arranging, and I spent a lot of time writing arrangements of standards that I like. I say "writing," but I got around to transcribing only about half of them. The rest I have periodically had to dust off and play from memory.
After stretches of not playing, which is more and more common these days, I spend time at the piano going through all of them to make sure I don't forget. Some of these have some very complex chords and complex passing chords, in which the number of voices in each hand will switch based on a variety of factors.
A lot of times, if I decide to simply play the bridge, or start at the second chorus, I'll get a few bars in and I will forget some detail, and I'll have to go over that part. Sometimes I will get it right, but other times, I keep getting it wrong.
But then I will start playing the arrangement from the beginning, arrive at that section, and play it perfectly.
My question is: Is this normal, and do other players experience this? I don't understand why I have to play a passage in the context of the whole piece rather than just randomly dive into a particular section.
Thoughts? Is this a weird quirk of TTK, or is this a thing among musicians?