Legendary Queen guitarist Brian May got up on stage last month with reunited British rockers The Darkness to perform several songs, and on Monday, some pro-shot footage of the performance was posted online.  Watch it below.  The Darkness are sceduled to launch a three week tour in North America in February, during which they will play songs from their 2003 and 2005 albums, as well as debut some tracks from their yet-to-be-released third album.