Grammy-winning a capella darlings Pentatonix are bonafide internet superstars. Since 2011, their official YouTube channel has racked up 19 million subscribers and a whopping 5 billion views, and their off-line success is also pretty impressive. They have a double-platinum Christmas album ("That's Christmas to Me") and shelves full of industry awards, but all that success didn't come easily. The group has been grinding since day one. No doubt about it, Pentatonix's transformation is turning heads. Here's a look back at their journey from being "The Trio" on YouTube, to winning NBC's "The Sing Off," to their current global sensation status.

#Pentatonix #Music #Transformation

Meeting at school | 0:00
The Sing-Off | 0:56
Dropped by their label | 1:58
Like a family | 2:49
Leaving school | 3:32
Influences | 4:07
Creating original music | 5:04
Their first Grammy | 6:05
Collaboration | 6:55
Social media | 7:37
Avi's exit | 8:31

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