Benjamin Britten Lord Harewood called it "the first genuinely successful British opera, Gilbert and Sullivan apart, since Purcell." Dismayed by the in-fighting among the company, Cross, Britten and Pears severed their ties with Sadler's Wells in December 1945, going on to found what was to become the English Opera Group. A month after the opening of "Peter Grimes", Britten and Yehudi Menuhin went to Germany to give recitals to concentration camp survivors. What they saw, at Belsen most of all, so shocked Britten that he refused to talk about it until towards the end of his life, when he told Pears that
Benjamin Britten it had coloured everything he had written since. Colin Matthews comments that the next two works Britten composed after his return, the song-cycle "The Holy Sonnets of John Donne" and the Second String Quartet, contrast strongly with earlier, lighter-hearted works such as "Les Illuminations". Britten recovered his "joie de vivre" for "The Young Person's Guide to the Orchestra" (1945), written for an educational film, "Instruments of the Orchestra", directed by Muir Mathieson and featuring the London Symphony Orchestra conducted by Malcolm Sargent. It became, and remained, his most often played and popular work. Britten's next opera, "The Rape of Lucretia",