Do you hear the people sing? Well, you'd better get used to it, because they're going be singing "at least through the summer of 2007." That's right: The allegedly limited-run revival of Les Misérables has been extended, according to a press release out yesterday. The current production of the eighties megamusical opened at the beginning of November, a mere three years after closing its original sixteen-year Broadway run, and despite bad reviews it's doing boffo box office: Last week it ran at 83 percent capacity. Meantime, Spring Awakening, the groundbreaking, enthralling, and critically adored new rock musical — "the new indie-rock treatment of Frank Wedekind's play about hormonal adolescents has just about everything going for it," says Jeremy McCarter— is freshly opened and has been struggling: Last week it only filled 60 percent of its house. (And that was an improvement.) Which means that shows about revolutions are bigger draws than revolutionary ones. Vive, it seems, l'ancien régime.