text: This composer included a duet between a clarinet and the soloist in the second cadenza of the "Allegro confermezza" first movement of his violin concerto.
full_question: This composer included a duet between a clarinet and the soloist in the second cadenza of the "Allegro confermezza" first movement of his violin concerto. Performances of a concerto by this composer made pianistWilliam Kapell famous. That piece uses an F-B double-flat-A flat theme and includes a flexatone part. HisViolin Concerto was written for David Oistrakh. An adagio depicting carpet weavers appears in a ballet by thiscomposer whose title character marries Kazakov after her husband Giko sets fire to a cotton warehouse. Anexcerpt from that ballet about workers on a collective farm begins with the xylophone playing F-sharp eighthnotes. For 10 points, name this Armenian Soviet composer whose Gayane includes the "Sabre Dance." 
first_sentence: This composer included a duet between a clarinet and the soloist in the second cadenza of the "Allegro confermezza" first movement of his violin concerto.
raw_answer: Aram Khachaturian [or Aram Il'yich Khachaturian]