In March 2018, Michel Legrand (who had previously composed the score for Welles' 1973 film "F for Fake") was announced as providing the score to the film. He had been secretly working on the film since December 2017. Orchestral recording began on March 19, 2018, in Belgium, and continued with a jazz ensemble later that week in Paris, although Legrand could not be present for the recording sessions, having been hospitalised with pneumonia at the time. Speaking of his work on the project, Legrand stated: