clipped from: www.nytimes.com The popularity of Guitar Hero, the video game in which participants compete by playing a guitar-shaped controller along with the music on a screen, may also popularize new instruments to a wider audience. “Guitar Hero’s combination of an alternative controller, an alternative music notation and an interactive pedagogy has doubled the number of instrumental music makers in the U.S.A. in just two years,” said James Plamondon, chief executive of Thumtronics, maker of a keyboardlike device called the Thummer.