Most nationalities in a simultaneous popular music sing-along
Who
The Worshipful Company of World Traders
Where
United Kingdom (City of London)
When

The most nationalities in a simultaneous popular music sing-along is 84, and was achieved by The Worshipful Company of World Traders in London, UK, on 8 October 2018.

The attempt took place at Goodenough College with all of the participants singing "Imagine" by John Lennon.