Fun, hip and retro vibe happening here - I like the posing, it really does remind me of a retro girl be-bop band. It's really about the background that is distracting my eye away from the girls. I'd mainly just recommend, like I often to, moving items around and taking many shots from different camera angles to see what really looks best to you. It's not always about getting all of the background details in, but really showing off the focus which in this case should be the girls.
This is your best shot. You did a nice job creating the set and I like the colors. Although they are turned away, you can tell that they are getting ready to start performing and that gives me a sense of anticipation. Nice outfits too.
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