New NXT Concerto, Using Twelve NXT Bricks
Flemming Sorensen says this about his new creation:
"Five (bricks) provide a steady tone and one brick works as melody master. Six bricks are melody slaves. The melody master flashes two bulbs every 12th note. The slaves see the flash using a light sensor and synchronize to the master."
(The NXT part of the concerto starts about one minute and forty-five seconds from the end of the video).