Y ou might think you know Kim Gordon . After all, she’s been a rock legend for more than four decades now, since rising out of the New York punk underground in the band Sonic Youth . She became a feminist icon with her fearsome charisma and art-school sensibility, helping to inspire the Nineties riot-grrrl revolution. She’s got a legend to uphold, laurels she could rest on. But listen to her amazing new Play Me and the question can’t be avoided: What if Kim Gordon is just getting started? After