GuestMrr makes an important point. But at this point all of the tools of production are coming within reach of the artist -- from recording right through to manufacturing, if you like. If you want to run off a lot of copies of your latest CD, it still makes sense to deliver your master to an outside company to get it done. But you shouldn't have to sign over the rights to anything -- it's a simple job for hire, more involved but essentially no different from bringing your concert flyers or mailers down to the local photocopy shop. So "ownership" of your material shouldn't be a major concern, as long as you don't sign anything without reading (and understanding) it first.
The big corporations still have the edge when it comes to distribution networks; they can get their stuff into the stores, and from there to a wider audience than might be available to the do-it-yourself artist. That's the next hurdle, but individual artists are making inroads there, too. It's going to be exciting to see how this develops over the next few years.