DigitarWorld.com Will Demonstrate "iMonica" - The Digital Harmonica for iPhone at MacWorld 2012 in San Francisco

SAN FRANCISCO, Jan. 17, 2012 /PRNewswire/ -- iMonica- Revolutionary Digital Harmonica:Feel like you need to do something productive?  Want to learn how to play a new instrument without paying much?  One of the easiest ways to learn music is to start playing a simple...