The I'm Yours star joined forces with Mtv bosses, government aid agencies in the U.S. and Australia and officials at anti-slavery organisation Walk Free to stage a special gig at the base of the Shwedagon Pagoda hilltop in the city of Yangon to draw attention to the international slave trade.
An estimated 50,000 fans flocked to see the show, who was the first international musician to play in the former Burma in decades, following the end of military rule in the Southeast Asian country last year (11).
He was joined on the bill by a slew of local artists, and the singer was humbled to be performing on such a huge stage.
Taking to his Twitter.com blog before touching down in Myanmar, he wrote, "En route to #LiveInMyanmar, honored to be an ambassador of awareness; exposing modern day slavery, transforming & saving lives".
The event occurred just four days after Mraz was saluted for his humanitarian efforts by the ASCAP (American Society of Composers, Authors and Publishers) Foundation.
He was presented with the Champion Award at the organisation's 17th Annual Awards Ceremony in New York on Wednesday (12Dec12), but didn't stick around to celebrate his prize and instead headed off to Myanmar.
He follows in the footsteps of previous recipients Billy Joel, John Mellencamp and Tony Bennett.