Peter Hollens
![](https://muzikum.eu/index.php/img/5f1ff961-7ba4-43ee-b064-fe4d75617f3b.jpg)
Peter Hollens is an American pop singer, songwriter and producer. He has been involved with a cappella music since 1999 when he and Leo da Silva founded the University of Oregon's a cappella group, On The Rocks, known as the first official collegiate a cappella group in Oregon.
source: Wikipedia