This thesis ethnographically explores Islamic piety in contemporary Egypt by investigating how many people conform, deviate, and contest the Islamic moral regime. It considers this through a case study examining metal music fandom and the metal music scene in Egypt. It examines the ways in which many people attempt to resolve the tensions between their desires and the value-systems of their social worlds, and it does so with a particular focus on impious behaviours that variously involve rejecting, suspending, and negotiating Islamic standards of piety. While the thesis is concerned with rejections of Islamic piety, it is more interested in investigating the ways people accommodate themselves to Islamic standards of piety through their transgression of such standards. Indeed, the central argument of this thesis is that many Egyptian metal fans accommodate themselves to an Islamic standard of piety through regulated transgression as much as conformity. This leads to a consideration of ethical self-cultivation as a form of personal development more complex than merely adhering to the dictates of tradition. Rather, in recognising that religiosity and moral piety are but one component of Egyptian social and cultural life, this thesis develops an analysis of regulated transgression that involves compromise, improvisation, and trial and error.