Graeme Kay introduces the last of this week's five programmes of performances given at this month's festival. Music includes Mozart's String Quartet in A, K464, performed by the Quatuor Mosaiques; some of Mozart's songs performed by soprano Joan Rodgers and tenor John Mark Ainsley with pianist Roger Vignoles; Brahms's Horn Trio in E flat, Op 40, played by the Nash Ensemble; and Mozart's Fantasia in F minor played on the new organ of Bath Abbey by Peter King.