Brian Newbould, the Schubert scholar who has “completed” the ‘Unfinished’ Symphonies Nos 7, 8 and 10, will talk about the String Quartet in G D887 to be played in the evening concert and, joined by the Fitzwilliam Quartet, will also talk about the Quartettsatz D703 and the fragmentary Andante that follows it, which will be played in his completion.