Lindsey Stirling (born on September 21, 1986) is an American violinist, musician, dancer, performance artist, and composer. She presents choreographed violin performances, both live and in music videos, including on her YouTube channel. In 2007, she introduced her YouTube channel, Lindseystomp, where she has posted many of her music videos. As of July 2012, the channel has over 100 million total views. In 2010, Stirling was a quarter-finalist on the fifth season of America's Got Talent, where she was known as the ‘Hip Hop Violinist’.
Since 2010, Stirling has released an EP and several singles. She performs a variety of music styles, from country to hip hop to covers of video game soundtracks.

Peter Hollens is an American pop singer-songwriter-producer. He has been heavily involved with a cappella music since 1999 when he co-founded (with Leo da Silva) the University of Oregon's award-winning a cappella group On The Rocks, known as the first official collegiate a cappella group in Oregon. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.