File-This Sept. 9, 2009 file photo shows Mickey Hart of the Grateful Dead performing at a memorial service for the late CBS News anchorman Walter Cronkite at the Lincoln Center in New York. Hart has

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File-This Sept. 9, 2009 file photo shows Mickey Hart of the Grateful Dead performing at a memorial service for the late CBS News anchorman Walter Cronkite at the Lincoln Center in New York. Hart has a new piece of equipment accompanying him on his latest tour — a cap fitted with electrodes that capture his brain activity and direct the movements of a light show while he's jamming on stage. (AP Photo/Charles Dharapak, File) less 

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Associated Press
Mon, Sep 9, 2013 12:36 PM EDT