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I wouldn't call those performer edits, those are more like co-composing edits. With my performs I allow them free range to interpret and edit the music to better fit their instrument or voice. I am no expert in every instrument I write for, so if there is a better way to play something or if the performer feels that it would be better at a certain dynamic or tempo to fit their instrument I allow them. However I don't allow them to change the music itself. I closest I have ever gotten to that was allowing a performers to add helper notes and a few graces notes. I wouldn't allow them to change the harmonies or omit passages because then it wouldn't be what I wrote. Every note on the page is their for a purpose so to add or take away changes the purpose. In short, I feel your performer is over stepping their bounds. You asked them to performer not collaborate in the composing process.