WHAT IS THE MARKET OPPORTUNITY: GarageBand comes free on almost every iPhone and iPad sold as well as on Mac computers. That installed base makes it one of the most widely distributed free apps in the world. Publishers have mostly ignored the product for the past five years despite its growing usage and importance in the professional music industry. WHO ARE WE TARGETING: _GarageBand For Dummies, _2nd Edition primarily targets hobbyist music makers who see GarageBand as the simplest way to create basic tracks without investing in costly hardware and learning a complex digital audio workstation software package.