I'm guessing these 2 are the new members of Dream. Jordan McCoy and Hunter Pecunia of Dream do their acoustic version of Lady Gaga's Just Dance

They have other acoustic covers up too including Hero/Heroine - Boys Like Girls, Everything We Had - The Academy Is and Disturbia - Rihanna among others.

The videos can be found on their official youtube page entitled OfficialDreamTV

Thoughts on the girls cover?

Jordin has a better voice than Hunter.

But I'm hella excited for Lady Phoenix now.
Haha.

They even did covers of Breathe and Wonderwall.