Being a musician currently in a country where CD and DVD piracy is almost more common than legit sources, I can see why Sony would want to protect their content. That is not an excuse for them, what they did was stupid. And, I am no PR firm, but they really messed that up as well. This whole root kit thing is crazy.
At any rate, they have posted a list of the titles with the offensive software. Looks like it includes some of my favorites, like Louis Armstrong, Ray Charles, Billy Holiday, plus 49 others. Includes instructions about how to tell if your CD is infected has the software on it. Better check your collection.