of these 3 random guys created the most wonderful impromptu jam

This video clip was allegedly uploaded to Facebook by Jaime Tatos Maldonado, who offered this description:

I was walking to kroger and saw this guy playing a song. It sounded good so I decided to record it. By the end of the song three guys started jamming. This truly is music in its simplest form. It really reminds of the Austin days. Enjoy.

Watch Amazing jam session - Three random guys sing together