Graham Nash has opened up about his current tension with David Crosby.

The duo have moved further and further apart over recent years and now Nash admits that he can no longer struggle to keep Crosby's interest.

He cited the never-released covers album which was in production with Rick Rubin dating back to 2010.

"It felt like the myth of Sisyphus, pushing a big rock up a hill, and it's slipping back," Nash told Rolling Stone.

"And I ran out of patience with it all. My relationship with David began to sour.

We used to be on the same page, but not anymore."

Despite the rift, he says he would never rule out a reunion.

"There have been times when I've been so pissed at us all for wasting time and not getting on with the job that I wouldn't talk to any of them.

But if Crosby came and played me four songs that knocked me on my ass, what the f— am I supposed to do as a musician, no matter how pissed we are at each other?"