If Glee was based on a real group of incredibly talented vocalists, it very well could have been Pentatonix. This five-person acapella group was originally formed by high school friends Kirstie Maldonado, Mitch Grassi, and Scott Hoying. From a viral YouTube channel to winning NBC's The Sing Off in 2011-let's remember folks, they got here with their voices and their voices alone. Think you heard a bass drop? You're mistaken, it's just Pentatonix member Matt Sallee clearing his throat. This group has been known for putting on an amazing show, so if you're looking to catch them in person, find the cheapest Pentatonix tickets on TickPick, where you'll save big by never paying any service fees.