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
Opera have remained in standard repertory, despite their controversial music and plots. Schoenberg's theories have influenced (either directly or indirectly) significant numbers of opera composers ever since, even if they themselves did not compose using his techniques. Composers thus influenced include the Englishman Benjamin Britten, the German Hans Werner Henze, and the Russian Dmitri Shostakovich. (Philip Glass also makes use of atonality, though his style is generally described as minimalist, usually thought of as another 20th-century development.) However, operatic modernism's use of atonality also sparked a backlash in the form of neoclassicism. An early leader of this movement was Ferruccio Busoni,