FILE - In this Nov. 8, 2011 file photo, singers Graham Nash, center left, and David Crosby, center right, perform a free acoustic concert of protest songs at Occupy Wall Street's Zuccotti Park encampment 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/Kathy Willens, file)

Associated Press
FILE - In this Nov. 8, 2011 file photo, singers Graham Nash, center left, and David Crosby, center right, perform a free acoustic concert of protest songs at Occupy Wall Street's Zuccotti Park encampment 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/Kathy Willens, file)
FILE - In this Nov. 8, 2011 file photo, singers Graham Nash, center left, and David Crosby, center right, perform a free acoustic concert of protest songs at Occupy Wall Street's Zuccotti Park encampment 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/Kathy Willens, file)
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