Read this and answer the question. If the question is unanswerable, say "unanswerable".

More recent Lancashire-born composers include Hugh Wood (1932- Parbold), Sir Peter Maxwell Davies (1934-, Salford), Sir Harrison Birtwistle (1934-, Accrington), Gordon Crosse (1937-, Bury),John McCabe (1939-2015, Huyton), Roger Smalley (1943-2015, Swinton), Nigel Osborne (1948-, Manchester), Steve Martland (1954-2013, Liverpool), Simon Holt (1958-, Bolton) and Philip Cashian (1963-, Manchester). The Royal Manchester College of Music was founded in 1893 to provide a northern counterpart to the London musical colleges. It merged with the Northern College of Music (formed in 1920) to form the Royal Northern College of Music in 1972.

In what year did Harrison Birtwistle receive the Sir title?
unanswerable