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Take Phil Lesh, who attended the band’s third-ever show. Then taking classes at the nearby College of San Mateo, and worshiping the likes of Charles Ives and Karlheinz Stockhausen as a student of classical and avant-garde musical composition, Lesh later underscored the physicality of the young band’s sound. “The music was so loud, even outside, and the groove so compelling, that I just had to dance … only to be blown back against the wall,” Lesh recalled. At Magoo’s, one had to navigate through “an almost palpable sea of sound.
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Brian Anderson (Loud and Clear: The Grateful Dead’s Wall of Sound and the Quest for Audio Perfection)