Who is John Sutherland from Zen and the Art of Motorcycle Maintenance and what is their importance?

John is a friend of the Narrator. He is a drummer, a Romantic with a conflicted attitude toward technology. He is in the book to provide a foil for the narrator's ideas about one unproductive stance with regard to technology. He represents an escapist mentality. He rides motorcycles, but has no interest in learning how to maintain one, and this baffles the narrator.