As December comes to a close, it seems everyone is reliving the year with the best hits of 2015. And why wouldn't they? The year 2015 was full of great music, from Taylor Swift's "Bad Blood" to Adele's triumphant return with her latest album, 25. The only thing that could top all of those amazing songs would be to combine them all into one. Last year, Us the Duo mystified everyone with their medley of the top hits of 2014 in 2.5 minutes, and now they're at it again. Let the couple take you on a musical ride through time as they cover everything from One Direction to Drake.