Os Mutantes are an influential Brazilian rock band that were linked with the Tropicália movement, a dissident musical movement during the Brazilian dictatorship of the late 1960s. The band is considered to be one of the main groups of Brazilian rock. Heavily influenced by Anglo-American psychedelic pop, they bridged Brazilian sensibilities together with studio trickery, feedback, distortion, and musique concrète. They released their now-acclaimed self-titled debut album in 1968.

Tropicália, also known as tropicalismo, was a Brazilian artistic movement that arose in the late 1960s. It was characterized by the amalgamation of Brazilian genres—notably the union of the popular and the avant-garde, as well as the melding of Brazilian tradition and foreign traditions and styles. Today, tropicália is chiefly associated with the musical faction of the movement, which merged Brazilian and African rhythms with British and American psychedelia and pop rock. The movement also included works of film, theatre, and poetry.