Kevin Olusola popularly known as K.O was one of those who won big last night at the 2016 Grammy awards . His group Pentatonix won, for the second consecutive year the \u2018Best Arrangement, Instrumental or A Cappella\u2019 category\u201cK.O \u201cOlusola is the beatboxer of Pentatonix. The group shone as they performed alongside Stevie Wonder. K.O and his group also presented the award for Song of the Year with the living music legend. Kevin "K.O." Olusola\u00a0 is an American cellist, beatboxer, saxophonist, pianist, songwriter, producer, and singer.