He often uses open tuning in his song writing. Of course, he could just as easily throw an open tuned guitar down a staircase and it would write the song itself.
But enough about LJ.
I was talking to a friend of mine, he said that back in the late seventies he went to a CS&N concert. During the song Guinevere someone in the audience yelled out "rock-n-roll!". David Crosby threw a hissy fit. He stopped the song and said "shut the fuck up. if you wanted to hear rock-n-roll you should have came here to see Led Zeppelin last week."
Led Zeppelin rocks. CS&N, not so much.