A few months ago, it was discovered (and complained about) that Sony BMG puts copyright protection (Digital Rights Management) on a few of their CDs.  This only becomes a problem if a user puts one of these CDs in their computer, at which point a little piece of software is installed that opens up a backdoor to the user's computer, leaving the computer open to virus intrusion.  Put nicely,
So, let's make this a bit more explicit. You buy a CD. You put the CD into your PC in order to enjoy your music. Sony grabs this opportunity to sneak into your house like a virus and set up camp, and it leaves the backdoor open so that Sony or any other enterprising intruder can follow and have the run of the place. If you try to kick Sony out, it trashes the place. And what does this software do once it's on your PC? ... The DRM itself is almost unbelievably restrictive, and some have suggested that the reasoning behind it is part of Sony's ongoing war over digital music supremacy with the decidedly more supreme Apple.
The Electronic Frontier Foundation put together a list of DRM-infected CDs.  Later, Sony published a more complete list: 
A Static Lullaby, Faso Latido
Acceptance, Phantoms
Amerie, Touch
Art Blakey, Drum Suit
The Bad Plus, Suspicious Activity?
Bette Midler, Sings the Peggy Lee Songbook
Billie Holiday, The Great American Songbook
Bob Brookmeyer, Bob Brookmeyer & Friends
Buddy Jewell, Times Like These
Burt Bacharach, At This Time
Celine Dion, On Ne Change Pas
Chayanne, Cautivo
Chris Botti, To Love Again
The Coral, The Invisible Invasion
Cyndi Lauper, The Body Acoustic
The Dead 60's, The Dead 60's
Deniece Williams, This Is Niecy
Dextor Gordon, Manhattan Symphonie
Dion, The Essential Dion
Earl Scruggs, I Saw The Light With Some Help From My Friends
Elkland, Golden
Emma Roberts, Unfabulous And More: Emma Roberts
Flatt & Scruggs, Foggy Mountain Jamboree
Frank Sinatra, The Great American Songbook
G3, Live In Tokyo
George Jones, My Very Special Guests
Gerry Mulligan, Jeru
Horace Silver, Silver's Blue
Jane Monheit, The Season
Jon Randall, Walking Among The Living
Life Of Agony, Broken Valley
Louis Armstrong, The Great American Songbook
Mary Mary, Mary Mary
Montgomery Gentry, Something To Be Proud Of: The Best of 1999-2005
Natasha Bedingfield, Unwritten
Neil Diamond, 12 Songs
Nivea, Complicated
Our Lady Peace, Healthy In Paranoid Times
Patty Loveless, Dreamin' My Dreams
Pete Seeger, The Essential Pete Seeger
Ray Charles, Friendship
Rosanne Cash, Interiors 
Rosanne Cash, King's Record Shop
Rosanne Cash, Seven Year Ache
Shel Silverstein, The Best Of Shel Silverstein
Shelly Fairchild, Ride
Susie Suh, Susie Suh
Switchfoot, Nothing Is Sound
Teena Marie, Robbery
Trey Anastasio, Shine
Van Zant, Get Right With The Man
Vivian Green, Vivian
So basically, if you have any of these CDs, don't put them in your computer.  But if you really want to, there's a way to disable the DRM from installing, though it sounds like it's more trouble than it's worth.  And there's also a way to sort of get rid of DRM if you're already infected.  Just ask Mr. Google. #entertainment