String quartet no. 27 : op. 20 no. 4 / Hob. III:34 ('sun' quartets); string quartet no. 39 in F sharp minor; op. 50 no. 4 / Hob. III:47; string quartet op. 76 no. 3 'emperor' in C; op. 76 no. 3 / Hob. III:62