ANTHEM (A Riff on the missing second half of Obama’s Campaign Slogan)
This score for this vocal work can printed or be downloaded to a smart phone and distributed through Twitter and Facebook so people can participate by Tweeting the score. A large group of people could have it at their disposal and it can be used spontaneously. If enough feet on the ground know the process and have the notes in front of them, it should be fairly easy to put together in the same way that the human microphone works.
CC license: Attribution-Noncommercial-Share Alike 3.0