Hollens is a one man a cappella group – he sings ALL parts of every song and then layers and blends them together. With over 1,300,000 subscribers his videos have reached over 100 million views. Hollens has collaborated with some of YouTube’s biggest artists, including Lindsey Stirling, George Watsky and Tyler Ward as well as Jason Mraz and Hunter Hayes. 　　He has released over 80 digital singles and has been involved with a cappella music since 1999 when he co-founded the University of Oregon’s male a cappella group On The Rocks. In 2010 he was featured on NBC’s The Sing Off Season 2 with On The Rocks. He also advises many companies including Patreon, Loudr, Tubular and is on the YouTube creator advisory board. He believes in helping and educating his peers and often consults and advises many artists.