Stills

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

Seldom in rock history have four guys who seemingly couldn’t stand each other sounded so good together.

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

When this on-again, off-again foursome reconvened for a new LP, it was a big deal.

Unfortunately, more trouble was just ahead.

They helped bridge the ‘60s and ‘70s with harmonies and songs about peace and love during a time of war.