I have no experience with music other than listening to it. I hear your arguments but have struggle with the suggested lack of originality - not saying you are wrong - it is just foreign to me. For example, how is it that a song like Steve Goodman's "City of New Orleans" is not original and thus deserving of intellectual property right?
How does your argument apply, for example, to the book that I had published a couple of years ago? I am certainly not an artist and may never write another book but I would not want to have anyone take this work and claim it as their own in any manner. The end result concepts in the book are original and as such are a product of my mind. Why should there not be intellectual property rights to protect this asset that I created? Note: I did site many works of others and always gave credit where credit was due but no one, to the best of my knowledge, has ever developed the concepts for public company boards that was reflected in the book.