Donald Macleod looks at two valedictory works from Schubert's final weeks - the motet Tantum ergo and the troubled String Quintet, which gathered dust for 25 years after the composer's death but is now regarded as one of the masterpieces of chamber music. Tantum ergo for soloists, chorus and orchestra, D962 Lucia Popp (soprano) Brigitte Fassbaender (contralto) Adolf Dallapozza (tenor) Dietrich Fischer-Dieskau (bass) Bavarian Radio Symphony Orchestra Wolfgang Sawallisch (conductor) String Quintet in C, D956 Heinrich Schiff (cello) Alban Berg Quartet.