Cristina Sá Valentim is a cultural and social anthropologist with a BA and MA in Antropology from University of Coimbra. She is a PhD candidate in Sociology, ‘Post-colonialisms and Global Citizenship’ studies, at the Centre for Social Studies (CES), University of Coimbra, with the support of a PhD Scholarship from the Foundation for Science and Technology, Portugal. Currently she is studying the colonial category of 'folk music' within the Cokwe people, during the Portuguese colonial context of Diamang (Diamonds Company of Angola) at Lunda, Angola, from 1940 to 1970 decades. Within the PhD she did fieldwork in Portugal and Angola through oral history survey and in colonial archive. The main areas of interest are within the areas of anthropology, sociology and postcolonial studies, specifically on social differentiation, portuguese colonialism, music, migration, power, agency, education, subjectivity and image. She is in charge for the backoffice maintenance of the Diamang Digital website (www.diamangdigital.net). She is an associated researcher at the Center for Research in Anthropology (CRIA) and researcher (without PhD) at the Institute of Ethnomusicology – Center for Studies in Music and Dance (INET-md), FCSH-UNL.