Arduino

Because I grow weary I will only provide a few links.
The following are some of the sites visited in the brainstorming process in our (Bryson & I) arduino project:

bidirectional_led_sensing.html
http://cs.nyu.edu/~jhan/ledtouch/
http://www.thebox.myzen.co.uk/Workshop/LED_Sensing.html
http://www.arduino.cc/playground/Learning/LEDSensor

I think this could be accomplished & when in one of the forums a guy alluded to including music - definitely wouldn’t mind exploring that further.