There are a very few musicians who can achieve extraordinary feats of memory. I learned about an American pianist who could memorize and in his head simultaneously play multiple pieces of classical music, his limit was either 4 or 5 pieces, I can't even remember which it was!
They tested him in a brain lab , getting him to memorize all these different pieces and play them in his mind while they had multiple recordings playing in a sound proof cubicle ,they checked up on him at regular intervals to get him to play what came next in their recordings of these different pieces and he was always 100% correct. Extraordinary feat of memory, but he made his living writing ragtime piano pieces in his head as he drove round America doing recitals.
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