Book excerpt: "Providing numerous case studies ranging across the Indian Ocean--across disparate time periods and historical and ethnographic approaches--Sounding the Indian Ocean: Musical Circulations in the Afro-Asiatic Seascape brings together the disciplines of Indian Ocean and music studies. As glimpsed above in the Sufi and Catholic networks connecting South and Southeast Asia, the chapters in this volume explore how music helps materialize networks of connection across the Indian Ocean Region (IOR) and in several of its distinct locales. Our focus is not simply the well-worn tropes of Indian Ocean cosmopolitanism, however, nor a definition of the IOR as a site for the harmonious mixing of populations (though some of our chapters do one or both of these). Rather, we show how music contributes to placemaking in distinct 'Indian Ocean worlds' (Srinivas et al. 2020). Instead of defining music's value in its ability to provide either narratives of identity formation or the celebration of mixture, Sounding the Indian Ocean explores the role music plays in both boundary-formation and boundary-crossing in Indian Ocean contexts, past and present"--