In an 8 hour long, crowd composed concert, we asked people to let the orchestra play via Twitter. Literally. Tweetphony was a symphony of music compositions created entirely of tweets based on the letters associated with notes. By accessing a special campaign site, which makes use of a digital piano interface, participants could compose music and listen to other musical tweets. The entire concert was streamed live and a video of each Tweetphony was immediately sent back to its composer.