Copyright is just a tool by which record companies are trying to stay alive in the modern age. The internet, and a lot of free-sharing culture that's coming up because of it, has made it difficult to keep data in one place. That's all the music really is: data.
Copyright is meant to protect art. It's meant to stop people from ruining specific businesses, such as book publishers, record companies, and film studios. Say I buy a popular new book at the bookstore. Say then that I photocopy that book. Before the internet, I would have to print that book myself, and I'd have a poor-quality bootleg of the original that I'd have to pay for in order to distribute. With the internet, now I could publish it online for free. All I have to do is pay the minuscule costs of hosting the file, and everyone can get a FREE poor-quality bootleg (or, with some more time investment, a high-quality bootleg). This is the problem the internet has produced. Before the internet, the only ones who could afford to produce bootlegs were other publishers, and corporations are far easier to sue than individuals because they're big and obvious. Now, any individual can publish the book for free, as long as they want, in relative anonymity as long as it's not too popular.
I believe there needs to be a better system to protect art than copyright. Copyright is becoming outmoded and has become bogged down in license agreements where it used to enforce itself by being too hard to infringe upon. The best we can do for now is try to make sure the artists get paid. Personally, I don't care if the record company gets its share. I try to live by the rule I should pay for it if I can, but if I wouldn't be willing to pay for it I feel justified in using it anyway. I can make an example with an album I got once. I got it because somebody suggested it for a specific sound I was looking for, but when I listened to it I didn't hear what I wanted. Haven't listened to it since. Maybe if I come across it later and like it, I'll buy some of their albums, and eventually come back and buy the album I took before.