Because any performer knows live music is never perfect. Recordings can give one that idea because they are cut and spliced. It’s not like wiping crumbs off a table. Anyway, I heard that quote as a child and it only made me feel nervously defeated.
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Good point. I think your soul and the emotion you put into music is the truest way to improve. We wouldn’t have such diverse types of music without people experimenting and finding a technique that works well for them. 
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I doubt there is an activity that requires more practice than playing an instrument.
What about sports?..