This article explores the impact of LM Radio—Rádio Clube de Moçambique’s B-Station, broadcasting in English and Afrikaans—in colonial southern Mozambique. Drawing on 441 issues of Rádio Moçambique magazine (1935–1973) and interviews with announcers, directors, and musicians, it reconstructs the station’s history and production practices and examines its reception among Mozambican musicians through the lenses of modernity and cosmopolitanism. Often regarded as apolitical, LM Radio’s trajectory reveals a complex engagement with the Portuguese colonial project and urban youth culture. The article also considers how these dynamics inform postcolonial memory, highlighting media’s role in shaping colonial modernity in southern Africa.