This Vienna Instruments Collection is a cornucopia of unique treasures for symphonic and orchestral works. It includes the bass flute, oboe d'Amore, heckelphone, basset horn, and contrabass clarinet. A special gem is the bass flute. With its velvety, earthy sound, it expands the flute family to its lowest register, evoking mystery and depth in dramatic music. The Oboe d'Amore adds a lyrical and rich member to the oboe family and was performed by experienced oboist Markus Deuter, who was also responsible for the French Oboe. The Heckelphone with its dark, expressive character rounds out the oboes' tenor register. The Special Woodwinds Collection features two additions to the clarinet family as well, including the warm, full-sounding basset horn that covers the alto/tenor registers, and the powerful, sonorous contrabass clarinet. Please note: Vienna Instruments require the ViennaKey. The ViennaKey is necessary to run any Vienna instrument. This USB protection device by Syncrosoft is not included in the box of any collection, it is a separate item you have to purchase additionally.