This chapter examines the aesthetic and imaginative significance of sound play, taking for its case study the poems of George Oppen. The chapter proposes that poetic sound play offers poets a way to explore value, whether it be a single vowel's sound value, a poet's preoccupation with certain subject matters, or that poet's particular political commitments. Through close readings of poems from across Oppen's career, and especially of Oppen's assonance and alliteration, the chapter argues that sound play becomes a social allegory, registering political possibilities which, on occasion, go beyond the poems’ explicit representations of social life. The chapter also shows how, as each sonic value is born afresh in each new usage, this sound play extends beyond the single poem to multiple poems. In the case of Oppen, sound play's continual production of the new through recombination promises, even as it cannot achieve, a future beyond capitalist reproduction.