If there existed a musical note that literally killed people with pleasure, Girl Talk would find it and use it (probably chopped up with three crunk hits, some Radiohead, and a joyous female wail you only later realize is from Carole King's Tapestry). The next decade will bring 1,001 variations of the music geek with a house-rocking laptop, and you shouldn't waste a chance to experience the guy who does it biggest and best. (Showbox at the Market, 1426 First Ave, www.showboxonline.com. 8 pm, $15 adv/$20 DOS, 21+.)