It’s like a glory hole … for your ears. Our Great White neighbor’s metro system has become the testing grounds for Pepsi’s new musical poster campaign. Agency BBDO has devised an interactive ad on Canadian subway cars (currently 100 cars in Toronto and Vancouver) that allow you to plug in (headphones not included) and get a taste of some brand new music. Ok, so the mariachi guys, conga players, and team of kids who pop n’ lock in the middle of the F train had this idea first, but those b-boy urchins aren’t trying to get you to visit Pepsiaccess.ca and download their artists. Where else can you find a captive audience that are all wearing earbuds?