Sony's QRIO, a 2ft.-tall robot, recently led the Tokyo Philharmonic Orchestra in a special performance of Beethoven's 5th symphony. View a video clip(1) (requires Real Player) or read more about it in this article(2) from New Scientist, which contains a second clip.
1. rtsp://cds101.bit-drive.ne.jp/shp/02-38-QR105.rm
2. http://www.newscientist.com/news/news.jsp?id=ns99994845