Graham Nash's band before he joined up with the Crosby, Stills deal. He was the real vocalist in any group he wound up with. Check out "Look Through Any Window," "Carrie Ann," "On a Carousel," "Jennifer Eccles," or Bus Stop for some great pop music.
I feel certain that this gentleman's experience with the drug-addled David Crosby was one that left him feeling empty. However, the money generated by Crosby, Stills, and Nash tied him to this enterprise long after he surely knew it was over.