Follow this A Capella group through the history of music. From the 1100's all the way up too 2013. They mix in some of the great hits of the last 100 years and sound amazing doing it.
A quintet of singers, collectively called Pentatonix, start off with a haunting chant from the 11th century. They then move on to Pachelbel's Canon from the 1600s, followed by Beethoven's Symphony No. 5 from the 1800s. The group eventually sings its way into the 20th century and finally the present day, which features hits from Justin Bieber, Rihanna and Carly Rae Jepsen.
Courtesy of Mashable.com