Eldredge, 31, graced the stage in New York City and delivered his take on "Winter Wonderland." Viewers were surprised how much the singer sounded like Frank Sinatra, especially since the song had very little country influence in its presentation.
Plus, many were just impressed at his smooth wardrobe, which included an eye-catching velvet jacket.
"I don't know who Brett Eldredge is, but his performance is the best so far," one viewer wrote.
Another viewer added, "Okay this guy Brett Eldredge is a country singer?? [I] didn't get that vibe at all, but wow I'm in love. Great performance!"
See some of the reactions below:
I don't know much about Brett Eldredge, but he's rocking that velvet jacket. 🔥 #RockCenterXMAS— Alex Suckow WLWT (@AlexSuckowWLWT) November 30, 2017
I absolutely hate country music but Brett Eldredge has saved this #RockCenterXMAS— Nicholas (@N_Russ0) November 30, 2017
Brett Eldredge voice is so heavenly #RockCenterXMAS— Gugi (@1G0D1GUGI) November 30, 2017
I don’t know who Brett Eldredge is, but his performance is the best so far. #RockCenterXMAS— Joe Cheuvront (@jlcheuvront) November 30, 2017
brett eldridge is currently channeling his inner frank sinatra and im dying #RockCenterXMAS— erin (@erinnpostt) November 30, 2017
okay this guy brett eldredge is a country singer?? didn’t get that vibe at all but wow i’m in love. great performance! #RockCenterXMAS— Laura Palmer ☠️ (@kandapillar) November 30, 2017
Photo Credit: Getty / Theo Wargo