This chapter explores the impact of ‘subgenre qualifiers’ that modify a genre title and distinguish between, say, ‘melodic death metal’ and ‘progressive death metal’. Endemic within contemporary metal discourse, these qualifiers function both to describe and prescribe the specific focus of a given subgenre, affecting composition, production, performance and reception (among other areas). Focusing on technical death metal, the chapter investigates the prescriptive nature of creativity contained within a relatively precise definition of ‘technical’ developed through consistent usage by artists, reliable acknowledgement from audiences and continual reinforcement by critics. By examining discourse from critics and artists, we can observe how subgenre qualifiers are used creatively, sometimes cast as a conceptual constraint against which an artist struggles, sometimes interpreted as a challenge and an explicit focus for an artist’s musical endeavours. The chapter considers how artists and listeners navigate technical death metal’s delimited forms of expression as a case study of the ostensibly highly stratified nature of modern metal.