Hundreds of spectators stuck around after Saturday's Canada Day Parade to sing O' Canada at Festival Plaza.
After a few rehearsals, a band accompanied a massive three part choir of Windsorites at around 1pm.
Windsor Mayor Drew Dilkens says the diversity of the crowd, shows what Canada's all about.
"Whether you're gay or straight, a man or a woman, whether you're a black person, a white person, whether you're Asian, it doesn't matter where you come from, we all come together as Canadians," says Dilkens. "It's a chance to celebrate that today and that's exactly what I saw when I looked out in the crowd."
He told AM800 News it's ,"the largest Canada Day Parade we've seen in a long long time" and the singing of the national anthem was a nice addition.
Almost go time for @CityWindsorON #Canada150 Parade. #cklw pic.twitter.com/4XJ2GwaO5Q
— Gord Bacon (@baconAM800) July 1, 2017
Sister cities from all over the world were in attendance, and Dilkens says it's a testament to how important Windsor's 125th birthday, and Canada's 150th are.
"Some [sister city relationships] are economic, some are cultural, some are educational, but when you have milestone anniversaries like these are, you know, 22 citizens plus the official delegation ... paid their own way to fly over to Windsor to be here to celebrate with us," he says.
Dilkens handed out the first of hundreds of red and white cupcakes that made up a Canadian flag after the singing of the national anthem.