1. Sam Smith: By now, you've heard Smith's breakout hit "Stay With Me," which became an international success when it was released in July. He quickly followed the hit with his melancholy tune "I'm Not the Only One," proving he's far from a one hit wonder. Smith has also proven to be popular amongst his fellow artists, attending the MTV Music Awards with Katy Perry
, and getting chummy with Taylor Swift at the American Music Awards. His amazing year has already included an AMA win for Favorite Male Artist - Pop/Rock.