Poulenc visited the US in 1960 and 1961. Among his works given during these trips were the American premiere of "La Voix humaine" at Carnegie Hall in New York, with Duval, and the world premiere of his Gloria, a large-scale work for soprano, four-part mixed chorus and orchestra, conducted in Boston by Charles Munch. In 1961 Poulenc published a book about Chabrier, a 187-page study of which a reviewer wrote in the 1980s, "he writes with love and insight of a composer whose views he shared on matters like the primacy of melody and the essential seriousness of humour." The works of Poulenc's last twelve months included "Sept répons des ténèbres" for voices and orchestra, the Clarinet Sonata and the Oboe Sonata.