Os Mutantes, formed in São Paulo in 1966 by brothers Arnaldo and Sérgio Dias Baptista and vocalist Rita Lee, are pioneers of Brazilian psychedelic rock. Integral to the Tropicália movement, they fused traditional Brazilian rhythms with experimental rock, creating a unique sound characterized by innovative use of feedback, distortion, and studio effects. Their influence extends globally, inspiring artists like Beck and Nirvana's Kurt Cobain. After a hiatus, they reunited in 2006, continuing to captivate audiences worldwide with their groundbreaking music. ([en.wikipedia.org](https://en.wikipedia.org/wiki/Os_Mutantes?utm_source=openai))