Ed Sheeran and Sam Smith are probably the two biggest male pop stars in the world right now. Sam Tsui and Casey Breves combined Sheeran's "Thinking Out Loud" and Smith's "I'm Not The Only One" in this incredible "mash-up" video. While this video isn't quite a duet between Smith and Sheeran, it's safe to say that it's so good it's damn close.
