In the fourth of these 15 weekly programmes, Christopher Hogwood talks about ' the greatest single landmark in Italian baroque music the trio-sonatas of Arcangelo Corclli. Corelli's Sonatas in A major, Op 1 No 3, in c major, Op 1 No 7, and in E minor, Op 2 No 4, together with other Corelli movements and music by Albinoni and Ravenscroft, are played by members of the ENGLISH CONCERT