Although I personally strive for it, I don't think originality is a point worth discussing. Music is about expression first and foremost. The difficulty we have today is that you can't freely express yourself. Many of the great hip hop records of the 90s, for instance, couldn't be produced today because sample clearing would be a nightmare.
I do, of course, understand that each work requires, errm, work. So I am fine with some form of protection for the artist. But imho it should be a rather broad protection. That is, releasing a cover without permission or selling someone else work (i.e. 100% of the lyrics or melody or even arrangement...) as your own is not ok. But I think as long as there is any form of creative alteration involved then "copying" should be fair play. Especially when several years or even a decade have past.