Well, its a good opener, simply because it's just a tweaked version of probably the most common opener.. (approach, ask a "feminine opinion", etc etc)
it gets the targets attention, some cheeky DVH (band member, everyone loves a rocker) makes them think for an opinion, you've got every possible outcome ready to be dished out.. an opener is just to break the ice - get a conversation started..
the next bit, which is probably even more important - is a transition into mid-game and kino escalation..
try this one (points go to Style and Cajun *mod version of the best friends test*):
--after your opener and you're rolling along-- "hey, i take it you two are like best friends or something??.. because you do the same facial expressions when you talk/smile/laugh.." etc
*they will look at eachother..guaranteed*
"see, you're doing it again by looking at eachother.. i could mistake you for sisters"
It's not bad

i'll test it tomorrow, i'm playing live with the band in one of the local open mic scenes we've got..
-Illusionist-