Peter Hollens, a pop singer and producer who is most well known for his YouTube channel where he performs as an acappella cover artist. He was featured in season 2 of The Sing Off in 2010 with On the Rocks. He became involved with acappella music in 1999 and has recorded collegiate acappella groups all over the nation. He has collaborated with popular YouTube artists such as George Watsky and Tyler Ward.
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