This article looks at audiocassette tapes that are produced and circulated within the Bay Area underground hip hop scene as subcultural artefacts through which an understanding of the key activities, ideologies and sensibilities that mark subcultural identity can be grasped. Using du Gay's circuit of culture (1997) as a template for organising ethnographic data, the article demonstrates the ways in which subcultural meanings are encoded into the activities surrounding the commodification of underground hip hop cassettes. Ultimately, it argues for a reading of audiocassette tapes as unique technologies that simultaneously embrace the progressive politics of subcultural inclusion while defending subcultural boundaries against mainstream co-optation.