"Over the course of the weekend, Ragnar Kjartansson's video art piece "A Lot of Sorrow", documenting the National's six-hour MoMA PS1 performance of their song "Sorrow", will be installed at the Contemporary Arts Center."
Original Article: http://pitchfork.com/news/57846-the-national-sufjan-stevens-perfume-genius-arcade-fires-will-butler-to-play-musicnow-festival/