Samuel Barber's Concerto for Violoncello and Orchestra in A minor, Op. 22, completed on 27 November 1945 (Heyman 1992, 252), was the second of his three concertos (the first being his Violin Concerto and the third his Piano Concerto). Barber was commissioned to write his cello concerto for Raya Garbousova, an expatriate Russian cellist, by Serge Koussevitzky on behalf of Garbusova and the Boston Symphony Orchestra. The work has remained obscure and performances are scarce, largely because of its extreme technical demands, but also because the heavy editing of the solo part by Garbousova hinders individual interpretation (Davies 1999, 34). The work has three movements: Allegro moderato, Andante sostenuto, Molto allegro ed appassionato. - Wikipedia.