Sean Stroud examines how and why Música Popular Brasileira (MPB) has come to have such a high status, and why the musical tradition (including MPB) within Brazil has been defended with such vigour for so long. He emphasizes the importance of musical nationalism as an underlying ideology to discussions about Brazilian popular music since the 1920s, and the key debate on so-called 'cultural invasion' in Brazil. The roles of those responsible for the construction of the idea of MPB are examined in detail. Stroud goes on to consider the impact of the Brazilian record industry in the light of theories of cultural imperialism and globalization and also evaluates governmental intervention relating to popular music in the 1970s.