Most nationalities singing a national/regional anthem simultaneously

According to Official Guinness Records,

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For a complete list of 2014 records, please visit 2014 Guinness Records in United Arab Emirates.

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Other United Arab Emirates records that might interest you:

• Longest graffiti scroll
• Tallest chocolate sculpture
• Largest pepper's ghost illusion
• Fastest Test match fifty (male)
• Largest Dallah coffee pot