This dissertation comprises an ethnography and mixed methodological analysis of Los Angeles’ contemporary DIY experimental music scene. By means of information gathered through participant observation and interviews, I describe the scene in the context of its historical precedents and its present state. From these observations I discern a sensibility of alterity and openness as a primary characteristic of the scene. This manifests as an investment in musical experimentalism as a mode of research into the unknown, anticipating as-yet unrealized possibilities of the as if. This leads to further reflections regarding how the aesthetics and practices of musical experimentalism that eschew conventionally-musical sound terms are nonetheless capable of affecting their auditors. I note that the common lack of typical analytical handles (melody, harmony, etc.) can confound some of contemporary musicology’s methodological frameworks. Following clues about ontological openness and musical meaning suggested by the act of listening, I deploy an explanatory methodological intervention offered by philosophical hermeneutics to negotiate this problem. This theoretical scaffolding helps to make sense of connections between the silences, non-musical, and un-structured sounds deployed in Los Angeles’ DIY experimental music scene and connected testimonies of aesthetic experiences occasioned thereby to refigure listeners’ horizons of understanding. The dissertation culminates in chapters that consider implications of philosophical hermeneutics in terms of musical experimentalism as related to sociological theories of the judgment of taste, and a metamodern characterization of the Los Angeles DIY experimental music scene’s post-postmodern structure of feeling.