Quicksilver Messenger Service (sometimes credited as simply Quicksilver) is an American psychedelic rock band formed in 1965 in San Francisco.
Sound engineer (and infamous LSD chemist) Owsley Stanley regularly recorded concerts at major San Francisco venues and his archive includes many QMS live performances from 1966–67, which were released on his Bear Recordings label in 2008-2009.
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Cipollina's highly melodic, individualistic lead guitar style, combined with Gary Duncan's driving minor scale, jazzy guitar playing, resulted in a clear, notable contrast to the heavily amplified and overdriven sound of contemporaries like Cream and Jimi Hendrix.