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acid rock
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acid rock

Igneous rock that contains more than 60% by weight silicon dioxide, SiO2, such as a granite or rhyolite. Along with the terms basic rock and ultrabasic rock it is part of an outdated classification system based on the erroneous belief that silicon in rocks is in the form of silicic acid. Geologists today are more likely to use the descriptive term felsic rock or report the amount of SiO2 in percentage by weight.


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The freely improvising group, the longest-running of San Francisco's 1960s acid-rock bands, now includes the other surviving members (Bob Weir, Phil Lesh and Bill Kreutzmann), augmented by a trio of seasoned musicians (guitarist Jimmy Herring, keyboardists Rob Barraco and Jeff Chimenti) and gutsy r&b singer Joan Osborne.
We're working with the family and with Big Brother and the Holding Company [the San Francisco acid-rock band with which Joplin sang], and we have rights to use Janis's master recordings.
After a 30-year run in which ``American Bandstand'' accurately reflected the changing musical times - rock 'n' roll, British Invasion, acid-rock, metal, folk-rock, disco, punk, new wave and the first stirrings of hip-hop - Clark and ABC parted ways in 1987 when the network wanted the show cut to 30 minutes.
 
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