Well, I'll start by saying that it's excessively annoying that each artist and independent label and movie creator and so on, are responsible for knowing about

Well, I'll start by saying that it's excessively annoying that each artist and independent label and movie creator and so on, are responsible for knowing about and checking for their material on every site that provides MP3s, videos, etc. New ones pop up all of the time and it's impossible for most of these companies and individuals to even know about them, let alone check them from time to time. But then it gets worse, because you have sites like Grooveshark, which plenty of people do know about, do police, and do contact to have their content taken down, only to have that content reappear every other day. As of right now both The Eagles and King Crimson have publicly shared their lengthy email histories with Grooveshark, asking repeatedly to have their content removed. Grooveshark removes it, and then 24-48 hours later most of it is back on the site. Technically this is covered by the DMCA and it is the artist and their label's job to go to Grooveshark every day, find the content, pull the links, notify the company, and keep doing this over and over. The problem is, between the upload and the takedown, the content is there long enough for people who might otherwise use a legal service or purchase the material to access it as much as they want.