I don't imagine this is new territory in terms of licensing for music, but may be for books.
Look at iTunes Match - you pay a monthly fee, what Apple does on the backend is likely royalty payments per song (there may be negotiation with labels as to iTunes match rates).
Look at iTunes Match - you pay a monthly fee, what Apple does on the backend is likely royalty payments per song (there may be negotiation with labels as to iTunes match rates).