Crosby, Stills & Nash reflect on 'Ohio' 44 years after Kent State

'CNN Special Report Witnessed: The Killings at Kent State’ airs this Sunday at 7p E.T. on CNN.

Singer David Crosby says his first reaction to reading Neil Young's lyrics for the song 'Ohio' was "this is gonna cause some trouble." Then he said "get us a studio and get it now." 'Ohio' was written as a response to National Guard forces opening fire on anti-Vietnam protesters on the campus of Kent State. Four protesters were killed, nine others were wounded. Sunday May 4th marks 44 years since the tragedy.