Happy: Pharrell released the World's Longest Music Video that lasts 24 hours!

The music producer, singer-songwriter and rapper Pharrell Williams has released his new music video for "Happy" that has the unbelievable duration of 24 hours!

The video works interactively and brings diverse people - whether anonymous or celebrities as Steve Carell dancing in the streets of Los Angeles. On the site created for the video, the user can choose to watch the video at any time those 24 hours and also post it on social networks.

It seems that interactive videos will become a new tool for many artists to promote their songs. Earlier this week the veteran Bob Dylan also released a video for "Like A Rolling Stone" where the user can interact with the images.

Check out the first four hours of "Happy" below: