Acapella sensations, Pentatonix adds a third show in Singapore for ‘Pentatonix Live in Singapore’ after tickets for their first 2 shows (12th & 13th August) sells out almost immediately upon release. Pentatonix is an acapella group consisting of lead vocalists Scott Hoying, Kirstie Maldonado and Mitch Grassi, vocal bass Avi Kaplan and beatboxer Kevin “K.O.” … More Sensational Acapella Quintet – Pentatonix adds third show in Singapore!