Crosby Stills Nash & Young

He wrote "I Watched It All Come Down" to express his regret they didn't do more together.

"His legacy will continue to live on through his legendary music," Crosby's wife said in a statement.

Singer admits his actions "pretty much destroyed" the group.

The addition of Neil Young in 1969 created great expectations – and their second album didn't disappoint.

Trio brought Neil Young on board shortly after releasing their debut album.

It wasn't long before they were back to fighting again.

On May 4, 1970, National Guardsmen squared off against anti-war demonstrators on the campus of Ohio’s Kent State University.