SSAATTBB chorus (with Sop and Alto solo voices) unaccompanied - Digital Download SKU: OX.9780193540262 From Piano Concerto No. 2. Composed by Sergei Rachmaninoff. Arranged by Bob Chilcott. Octavo. 27 pages. Oxford University Press Digital #9780193540262. Published by Oxford University Press Digital (OX.9780193540262). ISBN 9780193540262.For SSAATTBB (with S. and A. solos) unaccompanied . This rich arrangement of the second movement of Rachmaninoff's Second Piano Concerto for wordless a cappella voices was written for Harry Christophers and The Sixteen. Chilcott artfully reimagines a pianistic texture for choir, making full use of the potential of the human voice.