On 1 April, 2009, Trent Reznor announced Strobe Light, which was apparently Nine Inch Nails' brand-new album, featuring various artists. The website featured a repeating tempo accompanying the page, and a rapidly flashing GIF image at the top, "strobing" to match the album's name.
The album was an April Fool's day joke, and has been mentioned on several April Fool's since.
The text accompanying the download page was:
This "release" was an April Fools' joke on Reznor's fans, and was a parody of the current music scene's obsession with particular artists, production by Timbaland, and also a tongue-in-cheek poke at his own song titles and public image. Reznor may have been referencing Chris Cornell's album Scream, which was produced by Timbaland, noting a particular (tweet).
Any attempt to download the album would redirect the user to a faux "Blue Screen Of Death" (here), a mock at the Windows error message.
The embedded music beat on the is page likely a default beat from some type of music related software and not anything composed by Nine Inch Nails or Trent Reznor. The embedded file for the song is called "ACIDDANCE.mid" (here).