Stefan Olsdal is a Swedish musician and songwriter, best known as the bassist and guitarist for the alternative rock band Placebo. Born on March 17, 1974, in Gothenburg, Sweden, he has been a key member of the band since its formation in 1994. Olsdal's contributions to the band's sound include his distinctive bass lines and backing vocals. In addition to his work with Placebo, Olsdal has collaborated with various artists and participated in side projects. He is recognized for his versatile musical style, which blends elements of rock, pop, and electronic music. Olsdal's influence extends beyond his performances, as he also plays a role in the band's songwriting process.