Quicksilver Messenger Service was an American psychedelic rock band formed in San Francisco in 1965, known for their improvisational live performances and experimental sound that helped define the psychedelic era of the 1960s. Led by founding members John Cipollina and Gary Duncan, the band became influential pioneers of the San Francisco sound with their blues-influenced rock and extended instrumental passages. Their legacy continues to inspire generations of musicians and remains a cornerstone of classic rock history.
