Hollis Wong-WearKid SIster performed at Neumos on October 21, 2009.Oh, Seattle, we have to teach you how to dance. For the majority of last night’s show featuring rapper Kid Sister and production/DJ duo Flosstradamus, the crowd was mild-mannered, moderately stoic, and barely responsive. And for acts whose success is measured less by actual performance and more by the dancing frenzy they incite, the tacit, arms-folded observation simply deadens any show. This is not to say that either of the acts necessarily merited a wild, uninhibited response, but that if you’re going to go to a concert of party music, you gotta put something in to get something out of it. That said, last night’s show was a strong display of showmanship but an absolutely average display of talent, as Flosstradamus– mashup DJs Autobot and J2K– played a commendable set of extremely recognizable pop songs with an electro-house twist to open for the headlining lady, who emerged in leggings, long nails and chunky sandals my friend described as “orthopedic-like.” With Autobot manning the tables, J2K as her vocal back-up, and two very impressive back-up dancers in black bodysuits, Kid Sister demonstrated quickly that a quality vocal performance was low on her list of priorities for the evening. Frequently whooping and yelling “Seattle!” hoarsely, she was barely audible for half of her set; when she was audible, she was fairly unintelligible. For a couple of songs, including her encore song, she was blatantly lip synching, her voice sounding best when previously recorded. But while the musical output by her performance was underwhelming, Kid Sister’s strengths are looking good and getting hype, and by the end of the set, her jerky dancing, megawatt energy and truly sincere engagement and rapport with the devotees in the front row finally animated the crowd. I realized how many Kid Sister tracks have already been in frequent rotation over the past year and a half by local party DJs: songs like “Control,” “Beeper” and “Switchboard” are really catchy and a great platform from which she can launch a sustainable career of club hits. But I heard nothing new offered in her set last night, which seemed not to matter in the end. The majority of the crowd, flushed with a last-minute dance rush and notably inebriated, left satisfied and enamored with the sassy MC.