Tweet Harp is a musical instrument using Twitter and a laser harp. This instrument features the use of the human voice speaking tweets in Twitter as sounds for music. It is played by touching the six harp strings of laser beams. Tweet Harp gets the latest tweets from Twitter in real-time, and it creates music like a song with unexpected words. It also creates animation displaying the texts at the same time. The audience can visually enjoy this performance by sounds synchronized with animation. If the audience has a Twitter account, they can participate in the performance by tweeting.