Today’s urban environment can be a virtual cacophony of sounds including traffic noise, nearby trains, and aircraft lying ahead. If you have work to get done or if you’re holding an important meeting, it’s a safe bet that the grounds crew at your office building will choose that exact time to spend several hours mowing the lawn and running gas-powered leaf blowers and weed eaters directly outside your window. And let’s not forget how noisy a crowded office building can get from people talking on the phone and holding conversations in the hallways.