Wild Flag was one of the bands that arose during Sleater-Kinney's "hiatus", which lasted roughly from 2006-2014. Wild Flag was short-lived ... their only album and their four singles all came out in the same year, 2011. Somehow, I managed to see them three times during that short stint: in 2010, before they had released an album, 2011, and 2012 when the played The Fillmore. The band included two members of Sleater-Kinney (Carrie Brownstein and Janet Weiss), along with Mary Timony and Rebecca Cole. Thanks largely to Carrie, they were a potent live act (of course, Janet's drums helped, and Timony is a talent in her own right, as well as a good guitarist with a more traditional approach than Brownstein's).
Here is their network TV debut on Letterman:
Here is the video for the single "Electric Band":
And live, they cover Television and Patti Smith (the latter especially is on fire):