I remain confused by why people believe that "the community" should be able to set price caps on artwork owned by corporations. If Warner Music wants to charge $5 a play for Mylie Cyrus, I'm certainly not going to pay it, but how is it "wrong"? I'm surprised and happy that Pandora and Last.fm can exist at all, but I don't understand what entitles them to exist. We don't have a "right" to consume major label music.
Because copyright protection is not a right, but a limited privilege granted by the United States Constitution and intended to "promote the Progress of Science and useful Arts", not to make a sure $ for some corporation.
Hence the idea of compulsory licensing, for example. If the cost of the license, though, is prohibitive, it has the same effect of refusing a license, which (one could argue) would interfere with the progress of science and useful arts.