After the Crosby, Stills & Nash singer was revealed to have died on Thursday, his bandmate took to Instagram to pay tribute to the late musician. "It is with a deep and profound sadness that I learned that my friend David Crosby has passed. I know people tend to focus on how volatile our relationship has been at times, but what has always mattered to David and me more than anything was the pure joy of the music we created together..." Graham Nash / Instagram.