Amazing jam session - Three random guys sing together

Description from Jaime Tatos Maldonado's video on Facebook; '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'. Edit: I do not own the video, all rights to Mr Maldonado and the musicians.