As just an example of this, when my father died, I put together a slideshow of photos of him throughout the years. I used four of his favorite songs as the music, since it connected with memories that I and others have of him. We played it at his memorial and many people found it quite moving and asked me to upload it to Youtube. But because it had the music in it, I couldn't. Luckily Dropbox doesn't have anything like ContentID yet, but it still seemed wrong that copyright law would prevent me from sharing this piece of my dad with everyone that knew and loved him. There was no profit to be made from the sharing and what I wanted to share wouldn't cause any financial harm to the artists or labels who own the copyrights...if anything it would convince many people to buy those songs in a format that would work on music players.
It's frustrating that our current laws don't take into account that the creations that they make become part of our lives. The laws need to strike a better balance between compensating the creator and realizing that, once creations are released, they take on a life of their own and become meaningful to others. Humans seem programmed to share music...it's almost a tribal/instinctual thing. And no law that tries to controvert basic human instincts will ever be successful.
This is somewhat related to something else about business that people often seem to forget: Many people talk about businesses as though they are machines for converting employees time to products that they can sell for profit. But companies also produce culture, and that culture will be exported whether it's paid for or not. And they have a responsibility to produce good culture.
For me, that fact that we give anyone a 100-year monopoly on something that has probably recouped the creator's "investment" a million times over reveals a flaw in our system.
It's an analogue to political revolution: If people rise up and overthrow their government, it's probably illegal. But that doesn't mean it's wrong. And it doesn't mean those people should agree to give the government back because it was illegal.
Happy Birthday was stolen by society. Maybe that was illegal. But too bad. It's too late to protect it.