This article reports initial findings of research into the history of the British Musicians' Union (MU), which traces its roots back to 1893. It argues that, as the only organization that has been involved in all the major agreements within the UK's music industries, the MU is uniquely placed to provide a prism through which to view the professional lives of musicians—and the industries they work in—over a period of 120 years. It is further argued that understanding musicians as particular sorts of workers can shed further light on the complex relationships within those industries.Cet article expose les premiers résultats d'une recherche sur l'histoire du Syndicat des musiciens britanniques (British Musicians U...