The first chapter opens with a famous excerpt from Sartre’s La Nausée where the musical ‘object’ is positioned as resolutely independent of the material props upon which the reproduction of its sounding depends (the gramophone/record), whilst also mapping specific identities (the Jew and the Negress) and their attendant sufferings onto nothing more than its sounding. Thus Sartre, via Roquentin, highlights the way music seems to be both material and immaterial, mediated and autonomous, real and ideal, and deeply and viscerally human but also beguilingly transcendental. It develops this issues that arise from this well-known passage to sketch out some of the key issues in any thinking about music, introducing crucial tropes and associations as well as drawing on the musicological literature that has sought to deconstruct in critical and political ways what it is we mean (or often do not mean) when we think or speak about ‘music.’ Key considerations include music’s essence, definition and location, as well as its emotional and psychological impact (its effect and affective capacity more broadly), its similarities and differences with language, and the roles of composers, performers, listeners and, of course, technology, alongside music’s relationship to identity, society, culture and politics.