Dworkin has been dead for quite some time.
As have many feminist writers I admire.
I also rather like that John Donne bloke - he's both dead and not a feminist.
Leaving aside paraphrases of people who can't speak for themselves: SGB, yes, if you employ someone, you are in a position of power over them. This is why we have all sorts of laws to try to give some power back to employees. It still doesn't always work well.
If your 'musician' is a person desperate for money and threatened, they will not have a great deal of power.
To say this isn't equating sex and music, as they are quite different - the list of musically-transmitted diseases is an indicator here - but, insofar as the person with the money has the power, yes, they are the same. And yes, this doesn't bode well for the person who's being exploited.
Why on earth would we suddenly decide exploitation is ok if it's music? 