So far music fans have downloaded 3 million songs on Apple’s new iTunes music store. “This is an impressive figure considering the limited access that music fans now have to the service. Less than 1 percent of the country’s home computers are Macintoshes that are compatible with the iTunes Music Store, and only a fraction of those have a broadband connection to the Internet.” But now there are complications. Hackers have figured out how to copy songs from one computer to another, and now Apple is disabling features…