I found this on WalesOnline earlier:
It was the hit of 2013, reaching Number 1 in countries around the world.
Now the feel-good smash Happy by Pharrell Williams has been translated into Welsh.
Groups of people who speak Welsh across Caerphilly have joined forces for the video, promoting the use of the language.
The short musical film, called Hapus, was produced by Welsh language initiative Menter Iaith Caerffili.
Read more and see the video here: