Jason Mraz performs at the People's Square in Yangon on Sunday. (EPA Photo).
But democratic reforms initiated by President Thein Sein have led to the lifting of most sanctions, and the country is hopeful of a political and economic revival. Nobel Peace Prize laureate Aung San Suu Kyi, the pro-democracy opposition leader, was released from house arrest in late 2010 and won a seat in parliament last April.
Mraz called his top-billed appearance at the concert a "tremendous honour."
"I think the country is, at this time, downloading lots of new information from all around the world," he said. "I've always wanted my music to be here, (for) hope and celebration, peace, love and happiness. And so I'm delighted that my music can be a part of this big download that Myanmar is experiencing right now."
Organisers said Mraz was the first international artist to perform at an open-air, mass public concert in Myanmar. Jazz artists Count Basie, Duke Ellington and Charlie Byrd visited the country under US government sponsorship in the 1970s, when it was still called Burma, but played at much smaller venues.
Many in the crowd queued for two hours before being admitted to the concert site. Yangon native Sann Oo, 31, wearing a white T-shirt with a sketch of Mraz, said he was pleased that Mraz had come and that there would be a broadcast of the event.
"His visit can promote the image of Myanmar, because people outside have been seeing the country as an insecure place, and poor," he said. "Now they can see how we look like from the concert. It also opens the potential for more concerts by foreign artists."
About 50,000 concert goers cheer while watching the concert at the People's Square in the business capital. (AP Photo)Mraz has a history of involvement with human rights and other social causes.
But there was some criticism of his visit by campaigners for Myanmar's Muslim Rohingya community, which has been the target of ethnic-based violence this year that has forced tens of thousands of people from their homes into makeshift refugee camps. They feel Myanmar's government has been complicit in the discrimination, and that Mraz's visit provides it cover with the image of being a defender of human rights.
Mraz said he was aware of the issue, but that if he didn't come to do the concert because someone else had asked him to protest another problem, then that would not help tackle the exploitation and human trafficking issue.
"I understand that there is a lot of wrongdoing in this world," he said. "Today I'm here for this."
Walk Free used the occasion of Sunday's concert to launch a campaign calling on the world's major corporations "to work together to end modern slavery by identifying, eradicating and preventing forced labour in their operations and supply chains." They are seeking to have the companies make a "zero tolerance for slavery pledge" by the end of March next year.
"While many think of slavery as a relic of history, experts estimate that there are currently 20.9 million people living under threat of violence, abuse and harsh penalties," the Australia-based group said in a statement.
"Within this massive number, the majority of people - more than 14.2 million - are in a forced labour situation, used to source raw materials, and create products in sectors such as agriculture, construction, manufacturing and domestic work."
Jason Mraz mixes entertainment with education in his concert in Myanmar. (EPA Photo)The concert began with local favourites like Chan Chan, Sai Sai, Chut Htu Wai, Lynn Lynn, R Zarni before Mraz went on stage.
"By the time Jason Mraz took the stage, the huge crowd just wanted the night to go on non-stop," said Danny Lee, director for Community Affairs Development at the Jakarta-based Asean Secretariat.
"How could you not, when you see the huge crowd waving, singing, as music pulsates through the huge People's Square and beyond," he said in an e-mail sent to the Bangkok Post.
"As I enjoyed the show, I am also grateful for the changes that is happening, which allowed once-upon-a-time adversaries to pull this absolutely happening event off. Sure, there were hundreds of police and uniformed personnel to help the crowds find their places, but no one feels intimidated or threatened," he added.
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