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*Pharrell has followed the summer success of “Blurred Lines” and “Get Lucky” with what is being billed as the first 24-hour music video.

On Thursday (Nov. 21), the singer/rapper/producer released a video for “Happy,” (his single from the “Despicable Me 2” soundtrack) that runs 24 hours and features a number of celebrity cameos.

When viewers hit play on the video’s website, 24hoursofhappy.com, the clock starts ticking in the viewer’s local time, with the ability to fast-forward, rewind and skip around to different times of the day.

Along with Pharrell, the video features guest spots from Odd Future’s Tyler, the Creator and Earl Sweatshirt, Steve Martin, Steve Carell and more.

In August, Pharrell told us the story behind the lyrics for “Happy.”

Below, four hours of the video for “Happy”: