Graham Nash

Track appears on his upcoming album 'Now.'

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

LP marks his first record of original material in seven years.

Although they weren't able to fully reconnect, late singer-songwriter's efforts were "very significant."

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

Artists entertain from home while David Byrne, Robbie Robertson and Ozzy Osbourne react to coronavirus pandemic.

He agreed to sign deal if he was allowed to play original recording in studio just once.