Viral Video - You Tube sensations Sam Tsui and Casey Breves have once again mesmerized listeners over their surprisingly astonishing "Thinking Out Loud/I'm Not The only One MASHUP' video. Will the duo give the original singers a run for their money?

Ed Sheeran's "Thinking Out Loud" and Sam Smith's "I'm Not The Only One" have dominated music charts. Though the collaboration offers a revolutionary take on the melody of the songs, it still delivers the same eargasmic wave to the listeners.

Sam and Casey's stunningly layered four-minute acoustic performance has already earned over 5 million views and more than 65,000 likes. And the novelty of the mashup tune is just as good as the original, if not better.

While some commented the cover was great, others just don't agree.

"Average at best, sits in that 'appealing' key range that everyone just adores for no reason," a viewer commented. "Has Xfactor plastered all over it. Harmonies are just 3rds, range is lower than two octaves... sounds nice but weak as shit. People need to learn what a good voice is."

Is the collaboration a hit or a miss? Watch the video below.