Formed in 1965 by Beatles-influenced teenage brothers Arnaldo and Sergio Dias Baptista and Rita Lee, Brazil’s wonderfully psychedelic Os Mutantes made mind-altering rock music in the avant-garde Tropicália arts movement, before fading away the following decade (heartbreak! Drugs! Politics!). By the 1990s, everyone from Kurt Cobain to David Byrne was hypnotized by the surreal beauty of their music, made even more intriguing with bizarre costumes and homemade instruments. A version of the band reunited in 2006, and the players have revolved since, but for now, Sergio Dias remains the freaky backbone of the ever-witchy South American tropicalistas. (Triple Door, 216 Union St, tripledoor.net, 7:30 pm, $28–$35, all ages)