[orev]

Supply and demand.

There are a limited number of engineers and the companies who need them actually have to fill those roles in a reasonable amount of time to be able to get things done and stay competitive. This puts pressure on the companies to make the contracts more equal.

There are an (effectively) infinite number of young musicians dying for the chance to “make it big”, and the music companies don’t have the same kind of pressure to constantly have to keep filling seats to get work done. They can take their time and pick and choose however they want. This allows them to write the contracts more in their favor.