Harmonically, it is a step forward into a more advanced language, and the orchestration is somewhat more distinctive than his earlier orchestral work. However, it bears little relation to the fully mature works he is best known for today. One element that is typical is the form itself: the passacaglia is a form which dates back to the 17th century, and a distinguishing feature of Webern's later work was to be the use of traditional compositional techniques (especially canons) and forms (the Symphony, the Concerto, the String Trio, and String Quartet, and the piano and orchestral Variations) in a modern harmonic and melodic language.[citation needed]