This looks interesting...

They are trying to get a world record (certified by Guiness) for most people around the world singing a national anthem at the same time on the upcoming Yom Ha'Atzmaut later this week....

They say "Join thousands of Jewish people as we break the Guinness world record for "Most people singing an anthem simultaneously"

I don't know if "thousands" will be enough... A regular baseball game at Wrigley Field has about 40,000 people singing The Star Spangled Banner simultaneously every day. And Wrigley is a small baseball stadium. But good luck to 'em!

I don't know how many people that takes, but if you want to participate, or register your community.... good luck...