Right, so, Jeff Mangum is playing this benefit show for musician Chris Knox who suffered a stroke last year, though it's specified that his appearance will only be a short acoustic set. But, still. Jeff Mangum is playing. The guy behind Neutral Milk Hotel. And so are indie vets Yo La Tengo. And influential Kiwi rockers the Clean. And lots of other people like the fragile-voiced Sharon Van Etten and SNL writer/comedian John Mulaney. Also Jeff Mangum.