Shopping at Costco can be extremely stressful. There's people everywhere, lines for everything, and trying to find what you need is almost impossible.

Of course, there are tips and tricks to shopping smart at Costco, but nothing can really calm the storm.

But what we will say about Costco, is that their employees are always friendly and doing things to make the experience better for everyone. This includes the independent sales people who they bring in to advertise products.

One piano salesman was at a local Costco when he sat down to demonstrate how wonderful the sound is. Little did he know, he was about to go viral.

A pianist, who goes by hyp3r247 on YouTube, posted an incredible encounter with the salesman.

"You just never know what you will encounter in life!" she wrote. "Walked into a Costco, heard the salesman play a beautiful song and I joined in for some fun!! Totally made my day!"

The duo played a full-length version of Adele's hit song, Someone Like You.

Listening to people come together through music is always so touching. Two complete strangers joined forces to create a beautiful sound. The video has more than 3 million views, even though no one knows the names of those involved. It wasn't for publicity. It wasn't for attention. It was for the love of music.

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