John William Duarte (2 October 1919 – 23 December 2004) was a British composer, guitarist and writer.Duarte was born in Sheffield, England, but lived in Manchester from the age of six.Duarte was educated at Manchester Central High School (1931–35) and Manchester University Faculty of Technology (1936–40). He worked as a professional chemist until 1969, then abandoned chemistry in favour of full-time dedication to music, after having been persuaded by Len Williams, father of John Williams. His only formal musical education consisted in jazz guitar lessons with Terence "Terry" Usher (1934–6); the rest he learned by self-instruction. He also worked professionally as a player of the trumpet and double bass, performing music of many kinds, and regularly worked as a jazz musician until 1953, among others in the company of Coleman Hawkins and Django Reinhardt.