Pharrell Williams Wrote 8 Versions of 'Happy' Before It Was Finished

The singer reveals the creative process behind the hit song.
3:00 | 04/07/14

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Transcript for Pharrell Williams Wrote 8 Versions of 'Happy' Before It Was Finished
? happy happy ? Lara and pharrell up on the roof. Having so much fun with pharrell Williams on "Gma." A lot more songs from his new album are coming up. First let's welcome back pharrell Williams, come on in. Harrowing ride back down from the roof to make sure you get there. Run, run, run, go, go, go. I'm sorry, guys, you are like very professional here. 10, 20 seconds and counting. There we go. Happy birthday. That was Saturday. Happy birthday. You've given us so much happiness with "Happy." Eight versions? You know, it was actually nine versions and I had to ask myself the last time, I got to point zero and said to myself how do you make a song about a guy who's so happy and relentless in doing so and the answer had been sleeping in the question so long. I was Reading this a perfect biographical -- you're gem happy but one thing that makes you happy is your love of cartoons and you sort of drew from that. Well, yeah, you know, illumination is a fine animation house and gave me the opportunity on the first -- in the first movie to do the score with pereira and the second time they let me do -- doing a song score and second film this is the pivotal moment in the film. What am I going to do? I don't want to mess this up. I want to be on on the third and you run out of ideas. That's what we calling inness or nirvana. When you're at zero, when you don't know anything and you ask yourself a question and you listen, you open yourself up and, you know, the master, god, the universe speaks to you. You've done that in your whole life and this album is a departure from your previous album. The first album was a bit about me, me, me and this other guy named me but this one is not, it's devoted to such an incredible demographic taking care of me for over 20 years and I called it "Girl". That's just getting older and wiser and realize life isn't all about you? Yes, and in addition to that, just really honestly wanting to get back to like, you know, to women. Women just deserve so much better and so much more. I mean -- I couldn't agree more. You don't get paid as much as men do. That needs to change. A Martian rover but yet still we're also the same species that tries to tell women what they can and can't do -- Tell us about what you're doing with the NBA with their green week. With the NBA, I just did this butcher and with buy on yarn, long story short we basically take -- instead of make new polyester for clothing if your shirt says 50% cotton, 50% polyester, we have a sustainable place that instead of polyester it's yarn from plastic bottles. Rescue, recycle and reinvent. Please, please perform once again for us. Pharrell Williams. I would love to. Thank you so much. ? Different ?

This transcript has been automatically generated and may not be 100% accurate.

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