If you were anywhere near Queen and Bay last night, there's a good chance you're a teenager who likes pop music.

The Grammy Award-winning a capella group Pentatonix brought huge crowds downtown last night for a free concert celebrating the unveiling of this year's holiday window displays outside Hudson's Bay and Saks.

Omgggg @PTXofficial is amazing! #APentatonixChristmasDLX #HBHoliday pic.twitter.com/zhYvi1zvCF

— CASIE STEWART ☀️ (@casiestewart) November 2, 2017

A total of 11 new windows were unveiled to the crowd this year, including five "snow globe" windows with themes such as "Santa's Magic," "Arctic Adventures" and "Holiday Circus."

The Christmas window displays are breathtakingly cool, but that's always the case. The real draw for last night's event seemed to be the featured five-piece vocal group.

@PTXofficial just saw you in Toronto and you were so amazing! I cried the entire performance! Thank you so much for coming 😘😘😘😘😘 pic.twitter.com/oi6UONgaAX

— Lisa Rodmell (@lisa_rodmell) November 2, 2017

Pentatonix is insanely popular with young audiences around the world. The Texas-born a outfit, which formed in 2011, first rose to fame by winning Season 3 of NBC's The Sing-Off.

They've since released more than 10 albums and currently boast 2.8 billion (yeah, I said billion) views on their YouTube channel, mostly for covers and Christmas songs.

With angelic host proclaim PTX is at the Bay!!! @PTXofficial thanks for kicking off the xmas season right #HBHoliday #xmaswindow #TOxmas ❤️🎄 pic.twitter.com/hKFosdwUvQ

— Scott MacD (@TheScottMacD) November 3, 2017

The group's rendition of Hark! The Herald Angels Sing got the crowd to its knees, as evidenced by the number of videos on Instagram and Twitter.

Views of @PTXofficial performance from earlier tonight @CFtoeatonCentre #hbholiday #Toronto pic.twitter.com/d4pqZukdpK

— a m b z (@MsAmbzD) November 3, 2017

What's also awesome is the view some people got from the Eaton Centre's newly-opened sky bridge, which, as you should know, is really, really great.