Now while everyone here is (quite rightly) against the unauthorized use of software, It is a very different case with music. While software developers are just plain screwed by theft, the situation for musicians is much more complex.
An example: a co-worker of mine is mostly into death metal and very political hip hop. She listens to very little singer-songwriter based indie-rock. Someone burned a copy of a Bettie Serveert c.d. and gave it to her. She would never have heard this c.d. had it not been burned for her. She just isn't exposed to that kind of music in her day to day life.
She has since gone to see this band live and bought two more of their discs. She is now a fan. The chances of this having happened without the initial act of 'theft', (i.e. the c.d. being burned for her) are minimal.
Now it is clear that in this case that an act of 'theft' was beneficial to the band: they recieved income (i.e. the money from the tickets and c.d.s subsequently bought) that they would not have received otherwise.
So with that as a starting point.....LET THE FIGHT BEGIN!