jfruh writes "Most Slashdotters have been following the debate among the various players in the music industry about how much money artists (and their labels) get from traditional music outlets like radio and newer services like Pandora or Spotify. But Zoë Keating, a professional cellist who has a professional interest in the outcome of this argument, thinks there's one thing missing from all the proposals: more data on who her audience is. Even digital services can't tell her how many people heard her songs or where they're most popular. 'How can I grow my business on this information?' she asks. 'How do I reach them? Do they know I'm performing nearby next month? How can I tell them I have a new album coming out?'" She proposes mandatory reporting of information on listeners as part of royalties.