There's a cool photo of Bob Dylan and Muhammad Ali standing side by side...I think it was taken in '75 during the Rolling Thunder Revue tour. Dylan looks literally one half the size of Ali in height and every other way, but like Ali he is the greatest heavyweight champ of all time in his chosen field. Interesting photo.

Another very cool photo I've seen is of Bob and Joan Baez standing on either side of a large poster in 1965. The poster says "Stand Fast Against The Rising Tide of Conformity". Joan is holding some flowers and looking very madonna-like, very idealistic. Bob is looking very cynical. Great photo expressing the Yin and Yang of the movement at the time. Joan thought she could change the world. Bob thought nobody could.

Judging by my experience, Joan was right...but it all depends on what you think the phrase "change the world" really means, I suppose. I change it every time I change myself.