Read the following paragraph and extract the answer for the question: Who worked urgently to complete their opera before going into hospital for surgery?

In September 1970 Britten asked Myfanwy Piper, who had adapted the two Henry James stories for him, to turn another prose story into a libretto. This was Thomas Mann's novella Death in Venice, a subject he had been considering for some time. At an early stage in composition Britten was told by his doctors that a heart operation was essential if he was to live for more than two years. He was determined to finish the opera and worked urgently to complete it before going into hospital for surgery. His long-term colleague Colin Graham wrote:
Perhaps of all his works, this one went deepest into Britten's own soul: there are extraordinary cross-currents of affinity between himself, his own state of health and mind, Thomas Mann, Aschenbach (Mann's dying protagonist), and Peter Pears, who must have had to tear himself in three in order to reconstitute himself as the principal character.
After the completion of the opera Britten went into the National Heart Hospital and was operated on in May 1973 to replace a failing heart valve. The replacement was successful, but he suffered a slight stroke, affecting his right hand. This brought his career as a performer to an end. While in hospital Britten became friendly with a senior nursing sister, Rita Thomson; she moved to Aldeburgh in 1974 and looked after him until his death.Britten's last works include the Suite on English Folk Tunes "A Time There Was" (1974); the Third String Quartet (1975), which drew on material from Death in Venice; and the dramatic cantata Phaedra (1975), written for Janet Baker.In June 1976, the last year of his life, Britten accepted a life peerage – the first composer so honoured – becoming Baron Britten, of Aldeburgh in the County of Suffolk. After the 1976 Aldeburgh Festival, Britten and Pears travelled to Norway, where Britten began writing Praise We Great Men, for voices and orchestra based on a poem by Edith Sitwell. He returned to Aldeburgh in August, and wrote Welcome Ode for children's choir and orchestra. In November, Britten realised...
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