Crosby Stills Nash & Young

Singer-songwriter says both groups "started drifting away" from the values he believed in.

"Stephen [Stills] and Neil [Young] and I are great," Nash told 'CBS Sunday Morning.' "We talk often. We don't talk to David."

Four CDs will feature numerous outtakes, unheard alternate versions and an appearance from Joni Mitchell.

But he admits he still has problems with David Crosby, which don’t look to be resolved any time soon.

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.

Shortly after releasing their debut album, Crosby, Stills & Nash brought Neil Young on board.

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