The last time we checked in on them, the holidays were in full effect with a roaring fireplace in the picture. This time around, they turn the temperature down -- way down! Despite the stunning, "sub-zero setting," the production did not involve a green screen, and they write on the background for the icy scene that sets the stage:The location was a huge factor in picking the song Let it Go from Disney's movie 'Frozen.' Ryan Davis from the Ice Castles contacted Paul a year ago wanting us to film there, but at that time we could never think of a song that would do it justice until last December when Paul took his family to see the movie 'Frozen.' After coming out of the theater, he knew what needed to be done and got the ball rolling.Watch this white-hot classical cover made uniquely their own above.(huffingtonpost.com)ANN.Az