Kevin "K. O." Olusola is a classically-trained cellist and a professional beatboxer. He has risen to prominence as one half of the rhythm section of YouTube sensations Pentatonix. He was first asked to join Pentatonix for their run on season 3 of The Sing-Off when they saw his first celloboxing video.
While Kevin is touring and recording full-time with Pentatonix, he still practices cello daily and has returned with another solo cello/beatboxing performance. This time, it is a cover of Rhianna's popular "Diamonds", a song I find mind-numbingly repetitive in its original release. There is hidden emotional depth to the song, however, as Kevin demonstrated. It was also demonstrated recently by the Northeastern University's Nor'Easters a cappella group during their championship performance at the 2013 International Championship of Collegiate A Cappella.
Kevin's prowess on the cello is quite obvious, but to combine that with equally skilled vocal percussion is indeed a rare ability. I look forward to seeing much more from Kevin in the years to come.