Os Mutantes (, "the mutants") is the debut album by the Brazilian tropicalia band Os Mutantes. It was originally released in 1968 by Polydor and blends traditional Brazilian music styles with American and British psychedelia. The album includes a cover of The Mamas & The Papas' "Once Was a Time I Thought", translated into "Tempo no Tempo", and a cover of "Le premier bonheur du jour", previously recorded by Françoise Hardy. It was reissued in 1999 on Omplatten Records and again in 2006 by Omplatten's (and Polydor's) parent company, Universal Records. The album has received critical acclaim around the world, and was put at #12 on Mojo magazine list of "50 Most Out-There Albums of All Time". It appears at number 9 on Rolling Stone magazine's list of 100 greatest Brazilian albums of all time. It is also listed at 39 on Rolling Stone's "Top 40 Stoner albums". It also appears at number 9 on the Rolling Stones'''s 10 Greatest Latin Rock Albums of All Time. Background Os Mutantes made their public debut as a band in 1966 at a TV Record show, which went on air before the Jovem Guarda show, called O Pequeno Mundo de Ronnie Von. The band was in charge of the soundtrack, mostly playing rock versions of erudite compositions, and also covering hits of The Beatles and other bands. After their debut, the band was invited to be a part of many other shows, including Jovem Guarda itself, but they ended up being rejected because they wouldn't accept the many instruments the band would use on stage. In 1967 they met Gilberto Gil through avant-garde composer Rogério Duprat. With Gil, Mutantes recorded his songs "Bom Dia" and "Domingo No Parque" and debuted the latter at the II Festival de Música Popular Brasileira (Second Festival of Popular Brazilian Music) where the band won second prize. After that Mutantes started to get more involved with Gil's new Tropicália movement and took part in many notable events at the movement's onset. When performing their dig at Brazil's military dictatorship entitled "É Proibido Proibir" (It's Forbidden to Forbid) at the III Festival Internacional da Canção, the audience booed them. They also took part in the show Divino, Maravilhoso, which was the last major Tropicália event. The band contributed the title track to the Tropicália movement's audio-manifesto, the compilation album Tropicália: ou Panis et Circencis. The band also played on