this is the problem with the old concept of fair use and the internet and digital copying and distribution of today.
For physical objects like books, records, CDs, etc there are only a finite number of those particular objects made by the copyright holder. Pretty much all of those were paid for by consumers. Under fair use it was expected there was a finite lifespan for profitability for the copyright holder from those objects, so selling them used, loaning, and back in the day of cassette recording, only so much copying (and of poor quality) was possible. There were numerous court cases over the years to define and refine the laws.
Now enter the digital and internet era. You can make good sounding copies of those CDs AND instantly distribute said copies for free around the world with relative impunity. So instead of your favorite band selling a million hard copies of their latest and greatest album, only 10 or 100 thousand are sold because a small but sizeable enough percentage of folks will buy them, or borrow them, and share digitally.
Yes, you can belly-ache about how unfair the record companies are to artists (because they are

) but in the long run it's the artist who suffers and now has to make an income stream selling tickets to live shows (which always was part and parcel anyway for most bands unless you're Steely Dan back in the day) and swag. That's more time away from making good music.
So now what are professional musicians to do when it's easy and in fact expected for their music to be free for the downloading?
Edit: for the record, the record companies aren't fair to the consumer either at many levels, there's no excuse for CD prices given how cheap it is to burn one. So I get the frustration and people saying "the hell with it, I'm downloading and burning for free". Music and entertainment business makes venture capitalists look like altruistic choir boys
And I don't download, the sound quality sucks (though I admire the convenience), I like CDs and vinyl and pay for it new unless it's out of print.