Are you also in favor of providing musicians (and actors, writers, producers, etc) a lifestyle where they have the freedom to create, and give away their work for free, without going hungry? Where is that money going to come from?
In the real world, that's called "negotiation".
But to answer your question, a court would decide, based on comparable deals, and with ample (but not infinite) latitude for the rightsholder to deviate from established prices.