Conversation so far:
When was George Martin born?
George Martin was born in Highbury, London.
What year was George Martin born?
George Martin was born January 3, 1926.
Who were George Martin's parents?
George Martin's parents are Henry and Betha Beatrice Martin.
When did George Martin start liking music?
When George Martin was six, his family acquired a piano that sparked his interest in music.
What other instruments did George Martin play besides the piano?
Martin used his veteran's grant to attend the Guildhall School of Music and Drama from 1947 to 1950, where he studied piano and oboe.
What was George Martin's first career choice?
George Martin worked briefly as a quantity surveyor, and later for the War Office as a Temporary Clerk, which meant filing paperwork and making tea.
When did George Music decide music was his choice?
When did George Martin decide music was his choice rather than in the War Office.

Question: what was his first work
Self-contained rewrite: What was George Martin's first work before being a musician?