Photographers perform when they show work in a gallery or publish images in a book, brochure, periodical, or online. Everything else is composition. Film processing, proofing, final printing--it's all done in private and it's all composition. The musical analogy says almost nothing while seeming to say something (no one knows exactly what).
The question about master printers is a separate one. Many photographers are really terrible printers. For reasons that I will never understand, many photographers cannot even approximate what is needed for a given negative. They need a printer to help them--or a teacher to help them. Other photographers who are good printers cannot manage very large prints. They need master printers to realize such prints. I am sure there are many other circumstances where hiring a master printer is an excellent idea.
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