There are studies that show piracy can only increase sales. Piracy is never a lost sale, because if someone were to pirate something, they were never a potential customer in the first place, so at worst, piracy is free marketing.
But I'm not sure pirating music is the same as for movies or software as there's no tour at the end to reap the effects of "free" advertising.
Windows and Adobe Products are clear examples of this IMO.