Karmin were Amy Heidemann (Vocals/Guitar) and Nick Noonan (Vocals/Cajon) from Boston, Massachusetts. The Brokenhearted Songfacts reports that their name derives from the Latin word 'carmen,' meaning "song," with a slightly altered spelling to "hint at karma."
These are photos from concerts where Karmin played, so they may be of other bands that played the concert as well.
Y100 Jingle Ball 2012 Dec 8, 2012 Sunrise, Florida, United States Uploaded by Summer Nicole
Jingle Ball Dec 6, 2012 Boston, Massachusetts, United States Uploaded by Concertkatie
Q102’s Jingle Ball 2012 Dec 5, 2012 Philadelphia, Pennsylvania, United States Uploaded by Concertkatie