For the past six weeks, one of the best nightlife spots in the District has been the grounds of the Hirshhorn, where Doug Aitken's "Song 1" film has been screening on the museum’s exterior each evening. While the impressive public art installation continues until May 20, Friday is the real party. That's when the film's soundtrack (the doo-wop hit "I Only Have Eyes for You") is replaced by live performances by noisy art-punks No Age, minimalist composer Nicolas Jaar, sound collagist Oneohtrix Point Never and beat-heavy duo High Places. If Song 1: A Happening sounds like a small-scale Pitchfork Music Festival, you're not mistaken. The influential music Web site has teamed with Wired and the Hirshhorn to present the after-hours event.