Cities are, in part, machines for communication, some of which mediated, but a huge amount voiced. Voicing is staged by a complex system of spaces and infrastructures that confer or deny political weight to speakers, that focus attention on a performer, that assemble communities in deliberation. Urban streets are also the sites of the vocal cacophony of the public itself, but also of the united voices of protest. We cannot understand cities without understanding about voice, and we cannot understand voice without engaging with sound and its implications. This thread in my work has aimed to do exactly that.