This may be old hat to some of you but I just "discovered" Astrid Jorgensen who created a phenomenon called Pub Choir. Here are a couple of clips to introduce the performances that she organizes:-

https://www.youtube.com/watch?v=gNO-OSztM5s

https://www.youtube.com/watch?v=qtM-5lhZ-yo

She also auditioned on America's Got Talent which YouTube will lead you to.

Pub Choir sells out in hours in Australia. I just think it's wonderful to see so many people just enjoying themselves, something so needed in today's world.