This chapter considers what it means to attend to the dynamics and aesthetics of sonic mediation in modern writing, acoustic, and cinematic forms produced from the 1890s through to the mid-twentieth century. Tracking the various transformations of the rhythmic or metrical patterning of sound across a range of forms opens up a space for new ways of understanding both the specific sonorous qualities that different modern media are capable of registering, and how sonic transpositions and transferences across media affect the techniques with which human subjects respond to modern soundscapes. We begin with some methodological groundwork for the analysis of literature’s historically complex relationship to extra-literary sounds, and by identifying parallels and divergences with other media, such as the phonograph, radio and cinema. The challenges facing any correlation between modernist technique and the specific soundscapes of modernity are particularly demanding, not least because entirely new storage devices emerged simultaneously to do what literature could not, namely, record them. And yet, it was precisely this challenge that drove writers to engage as never before with what the symbolic apparatus of written language had never yet properly grasped: the vocal textures, rhythmic mechanizations, and stochastic accidents of real, socially embodied sound.