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 videos from concerts where Karmin played, so they may be of other bands that played the concert as well.
Boise Music Festival Jul 7, 2012 Boise, Idaho, United States Embedded by Katie Dodson