Overview:Broadcast of Prom 21: Beethoven – Symphony No. 9, ‘Choral’ Beethoven's much-loved Ninth Symphony, with its passionate plea for unity, is performed by the BBC National Orchestra & Chorus of Wales and the CBSO Chorus, conducted by Xian Zhang. Its companion piece is the European premiere of A European Requiem, written in 2015 by the great Scottish composer Sir James MacMillan.