Crosby Stills Nash & Young

Defining folk rock is a paradoxical task, to say the least.

Songwriter previews his book 'A Life in Focus' and teases upcoming albums.

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

Video tells story of track that didn’t make cut for ‘Deja Vu’ but appears on upcoming deluxe version.

He knew how much he’d earned from colleague’s talent, so handed over lyric sheets “with a good heart.”

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