Singer/songwriter Shawn Mendes treats fans to a performance at the Melrose Ballroom in New York City. Mendes came into the public eye via the social media platform Vine and at only 18 years old, he is one of only six artists to have two No. 1 albums on the Billboard Top 200 all chart at such a young age. Mendes performs some of his hits including "Treat You Better," "Stitches," and "Mercy."