A guitar player busking alone outside a supermarket slowly became part of an epic three-part harmony when two random strangers began to jam along.

The video was apparently captured by a Facebook user who initially just happened to like the guitar player's sound.

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."

Of course it's not clear how organic the jam actually is, and in the age of Jimmy Kimmel a random harmony is understandably suspect. But real or not, a jam is a jam, and this is a jam.

[h/t Daily Dot]