Pharrell Williams - Happy

Release date: 2013

"Happy" was entirely composed by Pharrell Williams, who was formerly the N.E.R.D. lead vocalist and Neptunes producer. He wrote and recorded the song for the soundtrack of the 3D computer-animated action comedy film Despicable Me 2. 

The song featured in a Beats by Dre ad featuring people in different elated states. They included Pharrell himself dancing around the street and rapper Pusha T walking through a record store.

Album: Girl