They are quite the duo!

 

Michael and Carissa Alvarado are members of a folk-pop group called US THE DUO.  And earlier this year, they were the first group to sign with a major label because their VINE videos were so popular.

 

 

At that point, they were posting six-second covers of pop songs, and racked up more than four million followers.  And now a YouTube video they posted on Tuesday is blowing up online too.

 

 

They took 12 of the biggest songs of the year . . . including "All of Me" by John Legend"A Sky Full of Stars" byColdplay, and "All About That Bass" by Meghan Trainor . . . and combined them into one two-and-a-half minute cover.