After hearing Ed Sheeran's "Castle on the Hill", we didn't think it could ever sound more beautiful- until Shawn Mendes came along! During his performance at Capital's Summertime Ball in London's Wembley Stadium, the "Mercy" singer traded in his signature guitar for a piano so he could sing a stripped-down version of Sheeran's hit. The result is a stunning, emotional ballad that will hit you with those feels! The song ends up being the perfect intro into Mendes's "Treat You Better." He really knows how to work those piano keys. Take a look below!