Burger is a product, a form of food, but still a product.
Pay to enjoy it, taking and eating it for free from a burger stand is stealing.
Music is a product, a form of art, but still a product.
Pay to enjoy it, taking and listening to it for free is stealing.
But, what if your friend makes you a hamburger?
What if that same friend makes dozens of hamburgers with ingredients that he paid for and hands them out to random strangers.