During Brazil's military dictatorship in the 1960s and 1970s musicians and artists were randomly arrested.
But rock sensation Os Mutantes avoided the purge and became one of the country's most popular Brazilian bands of its era. Their music blended native sounds with rock and roll from around the world.
The band's leader Sergio Dias explains what it was like for the band to reunite three decades later and the difficult times at the start.
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