Chamber opera is a designation for operas written to be performed with a chamber ensemble rather than a full orchestra. Benjamin Britten wrote several works in this category in the 1940s when the English Opera Group needed works that could easily be taken on tour and performed in a variety of small performance spaces. The Rape of Lucretia was the first example of the genre, and Britten followed it with Albert Herring, The Turn of the Screw and Curlew River. Other composers, including Hans Werner Henze, Harrison Birtwistle, Thomas Adès, George Benjamin, William Walton, and Philip Glass have written in this genre.