Customized Instruments linked via iPhone
Here's a free idea...
Customizing a generic guitar with servo's to ensure it stays in tune according to the presets. All presetting and other computer processing is done on the "attached" iThing. A few simple gestures would change your tuning. Additionally if they were "connected" iThings they could broadcast the live preformance of the bass player, and possibly the drummer as well. They could practice this way from anywhere in the city or wherever.
Customizing a generic guitar with servo's to ensure it stays in tune according to the presets. All presetting and other computer processing is done on the "attached" iThing. A few simple gestures would change your tuning. Additionally if they were "connected" iThings they could broadcast the live preformance of the bass player, and possibly the drummer as well. They could practice this way from anywhere in the city or wherever.