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.
Lindsey Stirling / Karmin Jun 4, 2015 Minneapolis, Minnesota, United States Uploaded by Jaynstephi