There's a good chance you haven't heard of a guy named "Theremin Hero", but after watching the videos below, you're most likely never going to forget him. On the latest episode of Britain's Got Talent, a contestent named Greig Stewart a.k.a Theremin Hero, captivated the judges and audience with what I can only describe as a laser, music, and video game spectacle. You can watch a short portion of his performance below.
Stewart has been playing the laser harp for sometime, jamming in various video game related concerts and shows. Here's a longer video, with him expanding on his Tetris performance.
There's nothing musically special about the laser harp, however, the instrument provides a level of presentation you've most likely not seen before. If you'd like to learn more about the laser harp, you may do so on Stewart's website. The instrument actually has an interesting history.