Antheil's best-known work is Ballet Mécanique. The 'ballet' was originally conceived to be accompanied by the film of the same name by experimental filmmakers Fernand Léger and Dudley Murphy, although the nature of the collaboration is mysterious. The first productions of Antheil's work in 1925 and 1926 did not include the film, which turned out to last around 19 minutes, only half as long as Antheil's score. Antheil described his first major work as 'scored for countless numbers of player pianos. All percussive. Like machines. All efficiency. No LOVE. Written without sympathy. Written cold as an army operates. Revolutionary as nothing has been revolutionary.'