Apple is starting a new business to make money... That business consists of a service that takes someone else's work - music - and resells it by streaming it. Hosting, storage, bandwidth, marketing, programming, management... are all cost elements of that new business, whose prime component is someone else's music!!!!
Is Apple forcing internet/mobile carriers to subsidize the stream during the trail? No.
Are marketers being paid? server administrators? server and hard drive manufacturers? Yes, yes, yes and yes.
And it's not like Apple is making the artists and musicians shareholders of the business either, so why should they be the only ones not getting paid? And remember, without artists and musicians, btw, there would be no music, hence NO business whatsoever.
Of course there's the argument that "Apple saved the music industry with the iTunes business model, which helped curve down piracy"... but that argument is seriously debated... and if it really saved the industry, why should it save it again now?
So yes, Apple should pay them as they pay for everything else needed to launch a profitable business consisting in reselling someone else's work.
Apple should live up to the responsibility it holds as the company it claims to be - by really innovating and developing better products - instead of looking for petty ways of cheating workers, artists, developers and customers from pennies of their work.
PS. I really wonder what makes some folks blindly and stubbornly defend Apple in what is a clear case of greedy douchebaggery. I seriously wonder.
I laugh because you seriously think this is a witch hunt against artists. Please, Apple thrived from artists and vice-versa with iTunes. It's not personal, it's BUSINESS.