The children's rights advocate, Satyarthi, said he nominated the song as it made him happy that it helps him know the world will end child slavery, UN Chief Ban Ki-moon's deputy spokesperson Farhan Haq told reporters.
Rahman chose his composition 'Infinite Love,' which he has called an "aspirational" video with the message that "an ideal world can definitely be created with a pure mind and optimistic results," according to information on his website.
Ban chose Wonder's 'Signed, Sealed, Delivered', saying that, to him, "it sounds like a new climate agreement and a new sustainable development agenda."
Rahman teamed up with the UN to contribute to the global music playlist to commemorate the International Day of Happiness on March 20 that will use the power of music to show solidarity with millions suffering from poverty and abuse.
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Rahman along with a host of superstars joined hands with the world body and the world's most personalised music streaming service MixRadio to launch the #HappySoundsLike campaign.
Ban had said the UN is "using the universal language of music to show solidarity with the millions of people around the world suffering from poverty, human rights abuses, humanitarian crises and the effects of environmental degradation and climate change."
Music fans were also able to post the song that made them the happiest with the hashtag #HappySoundsLike.
Established by the UN 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 UN will be undertaking several campaigns to help achieve this goal.
The campaign officially launches with the release of a global video, featuring a host of the stars singing along to raise awareness of the campaign.