FILE - In this Nov. 8, 2011 file photo, singers David Crosby, left, and Graham Nash perform at the Occupy Wall Street encampment at Zuccotti Park in New York. Music is woven into the fabric of Occupy Wall Street, much like when civil rights protesters sang "We Shall Overcome" or 1960s demonstrators heard "Blowin' in the Wind" or "Give Peace a Chance." Crosby and Nash's manager sent an email to Occupy Wall Street's website asking if the musicians could perform. (AP Photo/Mary Altaffer, file)

Associated Press
FILE - In this Nov. 8, 2011 file photo, singers David Crosby, left,  and Graham Nash perform at the Occupy Wall Street encampment at Zuccotti Park in New York.  Music is woven into the fabric of Occupy Wall Street, much like when civil rights protesters sang "We Shall Overcome" or 1960s demonstrators heard "Blowin' in the Wind" or "Give Peace a Chance." Crosby and Nash's manager sent an email to Occupy Wall Street's website asking if the musicians could perform. (AP Photo/Mary Altaffer, file)
FILE - In this Nov. 8, 2011 file photo, singers David Crosby, left, and Graham Nash perform at the Occupy Wall Street encampment at Zuccotti Park in New York. Music is woven into the fabric of Occupy Wall Street, much like when civil rights protesters sang "We Shall Overcome" or 1960s demonstrators heard "Blowin' in the Wind" or "Give Peace a Chance." Crosby and Nash's manager sent an email to Occupy Wall Street's website asking if the musicians could perform. (AP Photo/Mary Altaffer, file)
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