Duchess

All or mostly female rock group with matching haircuts and trenchcoats from the comic book Black Canary Vol. 4, #2 (September, 2015).

They have a grudge against Black Canary and set up a battle of the bands against them, recruiting The Banko Jim, and The Order of the Crimson Crystal Cult.

Band Bo M also shows up, being the biggest challenge, and probably the real agent engineering the contest.