Mozart’s ‘Spring’ String Quartet No 14 is the first of a set he wrote aged 26, dedicated to Haydn, who himself was bowled over by their structural and emotional scale, declaring Mozart to be ‘the greatest composer known to me’. An animated first movement leads to a humorous Menuet whose quirky offbeat accents Haydn must have appreciated – contrasted by darker trio material. A violin aria dominates the warm Andante, before a cheerful fugal finale. Brahms’s String Quartet No 3 of 1875 is similarly sunny and intricately polyphonic. A horn motif launches its pastoral opening Vivace, before an Andante whose serenity is punctuated by dramatic flashpoints. Viola leads in the Agitato minuet described by Brahms as ‘the tenderest and most impassioned I have ever written’, before a variations finale that eventually reintroduces the work’s very opening theme.