 To mark their 15 years anniversary, the quartet staged a two-week "The Beethoven Code" project during November 2006, where all of Beethoven's string quartets were performed over eight concerts, in the library building at the University of Oslo.An integral part of these series of concerts was a string of lectures by prominent scholars on various aspects of Beethoven's life and the impact of his music.The Beethoven Code project also included the making and screening of the film "Brødrene Gahl og jakten på Beethovenkoden", conceived, librettoed and directed by Sonstad, and featuring the four musicians as actors.