Pentatonix began with three friends who grew up together; Kirstin "Kirstie" Maldonado, Mitch Grassi, and Scott Hoying. They all attended Martin High School in Arlington, Texas. Determined to add depth and a distinctive dynamic to the group, Scott set out to add more vocalists, first adding Avi, who’d built a reputation as one of the most talented vocal basses in Southern California, and eventually took to YouTube, where he found the video for “Julie-O,” featuring Kevin’s cello-boxing (simultaneously beatboxing and performing the song on his cello).
They won the third season of NBC’s “The Sing-Off.” The group won $200,000 and a recording contract with Sony. They have also been nominated for a YouTube Music Award in the “Response of the Year” category for their cover of “Radioactive” featuring Lindsey Stirling. The video has garnered almost 40 million views. Pentatonix performed their Beyoncé medley on The Ellen DeGeneres Show in November 2013.