The RIAA, America's recording industry lobby, has apparently acknowledged that DRM is dead, according to TorrentFreak:
Jonathan Lamy, chief spokesperson for the RIAA declared DRM dead, when he was asked about the RIAA’s view on DRM for an upcoming SCMagazine article. “DRM is dead, isn’t it?” Lamy said, referring to the DRM-less iTunes store and other online outfits that now offer music without restrictions.
DRM is the technology that limits people's listening of an MP3 – you can't just copy it ad infinitum and do whatever you want with it if it's got DRM in it. I believe within the last few months the iTunes Store has either mostly or totally taken DRM off of the songs that they sell.
Also of note: TorrentFreak is probably the best resource on the internet I can think of when it comes to online copyright and filesharing news. Those sound like geeky and esoteric topics, but I think they'll be key to the future of all serious and popular music and video.