Great changes are taking place in the late modern world where not just more people but also more ways of communicating are constantly on the move. This study describes how not just late modern young people themselves but music, styles, features of popular culture, different artifacts, leisure time interests and even ideologies are travelling between different settings and scenes, locally and globally. Even more fundamentally, also discourse practices are on the move. This study explores multilingual language and discourse practices and repertoires in youth radio broadcasting in Finland and Sweden and paints a picture of multilingual life worlds where global and local features intertwine. Being multilingual is taken for granted and there are many different kinds of multilingualisms. The doctoral thesis research has been conducted in collaboration with Stockholm University and the University of Jyväskylä, based on a Cotutelle Agreement on the Co-Supervision of Doctoral Studies between Stockholm University, Faculty of Humanities and University of Jyväskylä, Faculty of Humanities.