It's a noise that doesn't fit into one idea. It's the sound of bicycles whirring down the bridge, the vibration of trucks rumbling overhead, the quickly approaching whoosh of the subway, the snippets of noise you hear as street musicians stay still while you keep moving. It's the majesty of organs spilling out of a cathedral on a Sunday morning, it's the lonesome howl of a harmonica played in the park, it's the thud thud of taxis driving over loose man hole covers and the inexplicable booms of noise that swell through sky scraper canyons.