I'd Rather Be Frying Bacon

From the Electronic Freedom Foundation:

The Customer Is Always Wrong: A User's Guide to DRM in Online Music

There is an increasing variety of options for purchasing music online, but also a growing thicket of confusing usage restrictions. You may be getting much less than the services promise.

Many digital music services employ digital rights management (DRM) — also known as "copy protection" — that prevents you from doing things like using the portable player of your choice or creating remixes. Forget about breaking the DRM to make traditional uses like CD burning and so forth. Breaking the DRM or distributing the tools to break DRM may expose you to liability under the Digital Millennium Copyright Act (DMCA) even if you're not making any illegal uses.

In other words, in this brave new world of "authorized music services," law-abiding music fans often get less for their money than they did in the old world of CDs .

The article goes on to describe the various ways that iTunes Music Store, Microsoft's Play For Sure, RealNetworks, and Napster2.0 retain control of the music that you paid for. It also suggests several good DRM-free options, like emusic, Audio Lunchbox (which bassmike suggested some time ago), Bleep (which is a little limited, catalog-wise), and Live Downloads (which has lots of, uh, live shows available, including several by Notre Dame's own Umphrey's McGee).