[youtube]http://www.youtube.com/watch?v=saMp44N1xbU[/youtube] [youtube]http://www.youtube.com/watch?v=mv1q3e79TP0&feature=player_embedded[/youtube] The Graffiti underworld sub culture on the London Underground has roots going back to the early days of Hip Hop in New York in the 1970‚Äôs. The London Underground is Europe’s largest subway system and is the world’s …