This one needs a little background: Back in the mid-70s, copyright law in the U.S. was reformed to allow musicians, like creators of every other kind of art, to gain sole right to their music after a period of 35 years. This would essentially cut the labels out of getting royalties of songs they had owned for years.
However, the law didn't start applying to songs until 1978, meaning that in two years, provided artists apply for it, artists like Bruce Springsteen, the Eagles, and Kenny Rogers ("The Gambler"), will be able to get back the rights to huge songs.
According to this story in the NY Times, labels are gearing up to fight against a wave of artists, claiming that in a wide majority of cases, musicians are "artists for hire," and labels actually own the copyrights, meaning they don't have to pay the artists after 35 years. This thing could be a another huge monetary loss for the labels. Read more here.