Sketch sheet 1779ß (1) (1): Complete course sketch for the cadenza for the 1st movement of the Sinfonia concertante in E flat

Mozart composed a small number of works for more than one soloist and orchestra, for which—depending on local traditions of the place where they were composed—titles such as Concertone (i.e. Grand concerto), Sinfonia concertante or Symphonie concertante, or simply concerto were used. Among the fragments, there is a substantive first Allegro of a concerto for violin, keyboard, and orchestra, KV 315f, that Mozart began in Mannheim in November 1778, while traveling back to Salzburg.