Sérgio Dias is a Brazilian musician and guitarist, best known for his work with the influential rock band Os Mutantes. Formed in the late 1960s, the band played a significant role in the Tropicália movement, which blended Brazilian music with international styles. Dias is recognized for his innovative guitar techniques and contributions to the band's unique sound. In addition to his work with Os Mutantes, Sérgio Dias has pursued a solo career and collaborated with various artists. His music often reflects a mix of rock, psychedelia, and traditional Brazilian influences, showcasing his versatility as a musician.