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My whole 100 Day Project is based on memorization, not at all on performance. Like you, I figured out that memory can be key to playing, so that’s why I force myself to memorize and play something each day. I know that much of what I’ve learned will be part of short term memory and gone tomorrow. But the seed of that song will be planted, and I can grow it from there with more practice.
My advice is to memorize all you can. It’s amazing the difference in how you play when you don’t have to rely on reading and then processing each measure in the song.