FILE - In this June 27, 2010 file photo, Stephen Stills, from 

FILE - In this June 27, 2010 file photo, Stephen Stills, from left, David Crosby and Graham Nash, from the band Crosby, Stills and Nash perform in Hyde Park, London. The band surprised the audience when they walked onstage uncharacteristically dressed in formal dark gray Brooks Brothers suits for a benefit concert with Wynton Marsalis' Jazz at Lincoln Center Orchestra, Saturday, May 4, 2013, in New York. (AP Photo/Andy Paradise, file) EDITORIAL USE ONLY.
Associated Press
FILE - In this June 27, 2010 file photo, Stephen Stills, from left, David Crosby and Graham Nash, from the band Crosby, Stills and Nash perform in Hyde Park, London. The band surprised the audience when they walked onstage uncharacteristically dressed in formal dark gray Brooks Brothers suits for a benefit concert with Wynton Marsalis' Jazz at Lincoln Center Orchestra, Saturday, May 4, 2013, in New York. (AP Photo/Andy Paradise, file) EDITORIAL USE ONLY.
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