Michael and Carissa Alvarado, who go by Us The Duo on Vine, have made quite a name for themselves in 2014 by covering other artists' music. <br /> <br />As the year comes to a close, the two harmonized some of the year's biggest hits in classic #6secondcovers fashion. <br /> <br />This time around, they need at least 2:30 to fit in all that bass.
