Your argument is simply wrong. Or rather, you take one interpretation of the situation and then denigrate in over-the-top terms all the other interpretations.
An orchestra produces a single unique performance. The productivity of the system of producing single, unique performance has no changed.
You're saying that this single unique performance can be reproduced - sure, that's true but now it's a different product. And certainly, that can increase the price of the final product. A programmer produces programs. Those programs are eventually reproduced on computers on a small or a large scale. A programmer producing a program used by few people still must be paid a salary similar to a programmer producing a program used across the globe - the cost of the program itself has to make up for this, if it doesn't, the programming isn't going to happen.
Moreover, the orchestra example is ... just an example. There are quite a lot of other fields requiring skilled workers, where the productivity has stayed fairly steady.
An orchestra produces a single unique performance. The productivity of the system of producing single, unique performance has no changed.
You're saying that this single unique performance can be reproduced - sure, that's true but now it's a different product. And certainly, that can increase the price of the final product. A programmer produces programs. Those programs are eventually reproduced on computers on a small or a large scale. A programmer producing a program used by few people still must be paid a salary similar to a programmer producing a program used across the globe - the cost of the program itself has to make up for this, if it doesn't, the programming isn't going to happen.
Moreover, the orchestra example is ... just an example. There are quite a lot of other fields requiring skilled workers, where the productivity has stayed fairly steady.