Graham Nash, Stephen Stills, and David Crosby chat about the challenges of creating their album 'Deja Vu', the inspiration behind their songs, the torturous process of making a timeless album, the trade-offs of success, reflections on a Wembley performance, the roller coaster experience of being in CSN and CSNY, and the anniversary of 'Deja Vu' and the release of their new album 'For Free'.