SINGAPORE - They were written off as a novelty act when they first came to fame as winners of television reality show The Sing-Off in 2011.
Since then, American a cappella group Pentatonix has become a force to be reckoned with in the global pop world. Albums such as their 2015 self-titled release and 2016's A Pentatonix Christmas topped the Billboard charts, their list of awards include three Grammys and their YouTube videos have clocked over 4.4 billion views.
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