Sounds a lot like screenwriting as described by, for example, William Goldman. He complained that writers in Hollywood--without whom the movies wouldn't exist--were usually massively disrespected, were the lowest men on the totem pole.
As an economist it seems like simple supply and demand to me. If artists can credibly threaten to "go get another song" and the songwriters can't counter-threaten to go get another artist, economics tells us who will get the short end of the stick.
Link courtesy of Michael G.