Extreme metal music, with its consummate loudness and distortion, and intransigent culture of transgressiveness, resists analysis. This dissertation embraces extreme metal’s liveliness and channels it toward a broad cultural and musical analysis, exploring avenues of loudness, rhythm and ecocriticism. The study of extreme metal opens a window on liminal auralities, allowing the listener to encounter the thresholds of listening and the sheer physicality of sound. These aspects of the extreme metal listening experience open up a broader range of issues: the effects of loudness on the body and mind, the convergent mental and physical experiences of rhythmic complexity, and the sounding out of the often troubled relationship between humans and the natural world. Built as a series of case studies grounded in moments of sonic experience, the dissertation unearths issues essential to the analysis of extreme metal music and relevant to sonic practice more generally. The introductory chapter situates extreme metal in its current context, examining both the genre’s increasing institutionalization and the turbulent aspects of its history. Chapter 1 contemplates the embodied experience of extremely loud, low frequencies via an auto-ethnographic reading of a performance by the band Sunn O))). The second case study discusses the rhythmic practices of the band Meshuggah, discovering how unexpected beginnings, rotated riffs, and shifting metrical frameworks animate multiple sites of listening pleasure. Via the divergent work of the bands Botanist and Panopticon, the final chapter studies the range of possibilities for musical environmentalism, demonstrating how extreme metal can engage both apocalyptic and nostalgic modes of ecocriticism. Extreme metal challenges music theory to grapple with what is lost in the act of analysis and to find better ways of tackling the liveliness of musical experience – an issue by no means exclusive to extreme metal. The demands of approaching such an insistently loud, distorted musical practice press the theorist to develop language that expands analytical practice toward greater inclusion of embodied experiences, and to detect how multiple sites of listening pleasure converge and intertwine., Music