This article examines the protracted negotiations between the castrato Francesco Bernardi, known as ‘Senesino’, and the Royal Academy of Music, documented in five letters sent by the singer to diplomat Giuseppe Riva between 1717 and 1720. They reveal a tight network of singers, patrons and agents, and highlight how Senesino negotiated not only for a role of primo uomo in the cast, but also for a role of artistic influence in London. This episode in Senesino’s career together with examples of ‘unofficial’ directorial practice and ‘hidden’ artistic influence of singers such as Nicola Grimaldi (‘Nicolini’), Antonio Bernacchi and Luigi Marchesi suggest a yet stronger presence of singers, especially castrati, in the economy of eighteenth-century opera than has been hitherto recognised.