They're more than music.
There are movies, software, etc.
Be carefull what you share.
Here's how I look at piracy:
A week before FoTR(The first lord of the rings movies) was in theaters, I downloaded a DVD quality copy of it. I didn't watch it, untill after I saw the movie in theaters. The only reason I don't already own a copy of the DVD is that I'm waiting for the uncut version(due in november??).
For the most part, piracy gets people listening to things they wouldn't otherwise hear. Most pirated music and software is stuff that the person would never buy or use otherwise. It gets the software out there though. With the vast amount of crap produced by the recording industry, this kind of sampling is a big help.
The truely despicable piracy though is amazinhunks who burn it and turn around and sell it. Just as bad are the people who buy it. Same goes for commercial users who are making money off of using it.