Crosby, Stills, Nash and Young recorded one of their most enduring songs, a response to the National Guard opening fire on a college campus. But the band itself was on the verge of collapse
Aretha Franklin, whom Paul Simon also had in mind when he wrote it, performed the song at the Grammys in 1971
What led to Paul McCartney's announcement on April 10, 1970 that the band was breaking up