Nelson Oliveira Pesquisa e Estudo de Mercado (Nopem) is an institute that surveys record sales and the most played songs in Brazil.[1] The institute started its activities in 1964, and its survey takes into account stores in Rio de Janeiro and São Paulo.[2]
- ^ "Como é feita a pesquisa". Folha de S.Paulo. 14 November 1997. Archived from the original on 29 April 2020. Retrieved 29 April 2020.
- ^ "MPB entra na era industrial". Folha de S.Paulo. 12 April 1998. Archived from the original on 29 April 2020. Retrieved 29 April 2020.