Carl Maria von Weber's importance as a composer for the clarinet is generally known. This volume of the Complete Edition contains for the first time a CD-ROM, thus pursuing new editorial techniques. The CD-ROM offers additional information on the sources, enabling the user to easily comprehend the Critical Notes: The respective source information is displayed on all interesting passages, including a synopsis of the source. Contents: Variations on a theme from the opera Silvana for clarinet and piano, B-flat Major Op. 33 (WeV P.7) · Quintet for clarinet, 2 violins, viola and violoncello B-flat Major Op. 34 (WeV P.11) with a digital edition of Weber's Clarinet Quintet · Grand Duo concertant for clarinet and piano E-flat Major Op. 48 (WeV P.12).