DeeDee and the Powerpuff Girls/Little Jerry and the Monotones

DeeDee from Dexter's Laboratory, and Blossom, Bubbles and Buttercup from The Powerpuff Girls cosplay of Little Jerry and the Monotones band from Sesame Street.

DeeDee as Little Jerry

Blossom as Big Jeffy

Buttercup as Rockin' Richard

Bubbles as Chrissy