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The musical duo of Twenty One Pilots almost defies description. What are they? Rap? Electropop? Rap-rock? Straight-up rock music? Whatever their music is, it’s highly enjoyable, and it resonates with a lot of people.

More KROQ Almost Acoustic Christmas 2015 Photos: Halsey was a highlight at KROQ's Almost Acoustic Christmas 2015

The Ohio duo showed up at night one of this year’s KROQ Almost Acoustic Christmas and delivered a typically moving and energetic set. Take a look at photos above.