Classical musicians do this all the time. They want perfection. So they piece things together. Eight bars of this and six bars of that. Glenn Gould said that with a recording he wanted to make perfect versions of pieces.
“Memory is quite central for me. Part of it is that I like the actual texture of writing through memory.”
“He 's ruthless only because of his ideals. Unfortunately he doesn't succeed. The thing fails and gets out of hand and takes charge of him. Idealism is the only excuse he could have and it's a great excuse.”