The United Nations and music streaming service, MixRadio, marked International Day of Happiness and the launch of the #HappySoundsLike playlist on Friday with a surprise performance from singer / songwriter, Cody Simpson, at South by Southwest.

Recognizing that music has the power to spread happiness and inspire solidarity and hope for a better tomorrow, United Nations Messengers of Peace and Goodwill Ambassadors, along with international artists including Britney Spears, Nicole Scherzinger, Ed Sheeran, Charlize Theron and John Legend contributed their happiest track to create the world’s happiest playlist, #HappySoundsLike.

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“I am really pleased to be part of such an amazing campaign with the United Nations and MixRadio to raise awareness of International Day of Happiness. I hope everyone gets behind the day and listens to the #HappySoundsLike playlist,” said Cody Simpson.

Established by the United Nations General Assembly in 2012, International Day of Happiness acknowledges that “the pursuit of happiness is a fundamental human goal.” In its 70th anniversary year, the United Nations will be undertaking several campaigns to help achieve this goal.