When it comes to shopping, Costco is one of the best places to hunt for what you want and grab items in bulk with huge discounts. But in this video, shoppers were not only able to view the high quality items of the store but they also witnessed a stunning piano duet of a shopper and a salesman. Their stunning performance came in random and that made the entire thing so amazing. Two strangers making a perfect piano duet at the first try is nothing but worth the trend. No doubt that this video earned over 3 million hits!