SEATTLE - Thousands of fans celebrated the Seattle Sounders' first MLS Cup victory over Toronto with a jubilant parade through downtown Seattle.

Crowds lined the streets Tuesday chanting "Seattle ... Sounders," waving signs and cheering as a procession of trolley buses carried players and coaches along Fourth Avenue.

Police officers walked alongside the buses, as players leaned out to shake hands with fans and sign autographs. At one point, defender Roman Torres could be seen thrusting the trophy into the air.

The sea of green and blue colors made its way down Fourth Avenue toward Seattle Center, where a rally celebrated the team's dramatic victory on penalty kicks.

"Hopefully it happens again, but if not, we want to have these memories," said David Overcash, who attended the march and rally with his daughters. "They'll think back forever and remember when we were at the parade. It's priceless! It's invaluable."

KING 5 crews followed the march and rally and tweeted the action with fans. (App users can click here for updates)

Many parents and kids played hooky to go to the celebration.

“Go to support the community and support the Sounders. It's a learning experience,” said Tim Taft.

Sounders star Brad Evans had written an excuse note. You just needed to fill in your name and hand in the slip that reads: "I understand that you need everyone to be at the office or in class, but you also don't want to be the boss or teacher that prevents a loyal Sounders FC supporter from experiencing history."

Jessica Delgado said her 11-year-old daughter, who plays soccer, asked if she could get out of school early. Delgado said yes. She sees it as a field trip worth taking.

“I think it is life-long memories and they can see what they can do if they really put their mind to something and play hard,” said Delgado.

Mayor Ed Murray issued a proclamation while speaking at the rally, declaring December 13th as 'Sounders Day' in Seattle.