I saw a neat video of a group called Pentatonix, the video is called Evolution of Music where they sang a medley of songs from 11th Century, 1600's to 2010's and they performed they songs a capella.
Being a lover of music, I know I just have to share the video on my blog, so here it is.
Just in case you're wondering what were some of the songs you don't recognize, here's a list of the songs as posted on their YouTube link:
