Music From the 11th Century Until Today in Only 4 Minutes

It is safe to say that music is always evolving, new instruments are created, the impact of technology on the industry, as well as the changing sound of society all aid in creating the sound of the moment.

I thought this was one of the coolest videos I have seen. In only 4 minutes, acappella group Pentatonix, also known as PTX, shows the evolution of music from the 11th century until now. These guys and gal are really talented and come from Arlington, Texas. They also won the third season of The Sing-Off on NBC in 2011. It's definitely worth a listen.