The MusicPad Pro Plus is a five-pound tablet computer that displays music scores. “The $1,200 device, with a 12-inch liquid-crystal-display touchscreen, is the first of a class of computers that enable musicians to store music and edit it onscreen. Soon it will also allow them to communicate with one another over wireless networks. In much the way that portable digital audio players have changed the way people consume tunes, tablets like the MusicPad are changing the way musicians use sheet music, which is so compact that it can be digitally stockpiled far more cost-effectively than MP3 audio files.”