Just go to this show—it's the right thing to do. What makes it right? DJ Shadow simply means it can't go wrong. The legendary Bay Area producer, remixer, and scratcher will be in the house with Cut Chemist. (The two recently released a collaboration called Hard Sell.) Kid Koala, the turntable genius from Montreal, will also be in the house. Indeed, this is less a show and more of a temporary temple for a hiphop art that was eclipsed many years ago by the self-obsessed rapper. (Showbox at the Market, 1426 First Ave, 628-0888. 8 pm, $30 adv/$35 DOS, 21+.)