UNITED NATIONS (AP) -- Musicians Juanes, Cody Simpson and Inna Modja are headlining a special event at the United Nations for World Humanitarian Day.
The stars lent their voices Tuesday to the world body's effort to draw attention to major humanitarian crises in Syria, Yemen and elsewhere.
Secretary-General Ban Ki-moon says that not since World War II have so many people been displaced by conflict.
The U.N. says its humanitarian office needs $20 billion this year to keep 100 million people in need alive -- double what it sought in 2009 -- but it's received less than 30 percent.
Australian singer Simpson let a Syrian refugee use his social media account for a day during the campaign.
Colombian singer Juanes tweets that "it is an immense honor" to take part in the event.