Our culture no longer bothers to use words like appropriation or borrowing to describe those very activities. Today's audience isn't listening at all - it's participating. Indeed, audience is as antique a term as record, the one archaically passive, the other archaically physical. The record, not the remix, is the anomaly today. The remix is the very nature of the digital.
Which is great news. Pbviously he intends to release his next novel using a Share-alike-Attrib-Non-commercial CC license.