The Leo High School boys' choir returned to the "America's Got Talent" stage on Tuesday night to compete in the semi-finals. Now, they wait to find out if they're making their way onto the finals.

The beloved choir has been making Chicago proud with their run on "America's Got Talent," and last month, voters advanced them to the semifinals.

On Tuesday night, the group sang Fall Out Boy's "Centuries" on stage with fiery effects. They got praised by the judges, including Simon Cowell, who pleaded with viewers to vote for them to compete in the finals.  

"I have to say I just really, really, really, really like you and I love Mrs. Hill," Cowell said. 

Members of the choir joined CBS News Chicago on Wednesday morning to reflect on last night's performance. They said they are ready for this opportunity. 

"We feel like we did the best we could, and also we have more to bring," One member said. "That's not it." 

Voting ended at 6 a.m., and the group will find out Wednesday night if they will advance to the finals. 

Ahead of their performance Tuesday, choir members told CBS News Chicago they were going to prove to everyone they belong in the finals. 

"It feels amazing, truly, it's bigger than anything we ever imagined," a choir member said. "It's bigger than us."

Leo High School Choir Director Ladonna Hill said she is "overjoyed." She said she had no idea when they started this process, they would reach this "magnitude." 

"I'm grateful for this platform, I'm excited for my guys and of their hard work and resilience," Hill said. 

Leo High School is hosting a watch party for students, faculty, and fans starting at 6 p.m.

Leo High School community share excitement about the choir's AGT run: "They've won in our hearts."

Leo High School has a lot to celebrate lately, even those who graduated decades ago.

Alumni Dan Stecich, who graduated from the school in 1975, said he can't recall this level of excitement.

The choir has a shot at the finals of America's Got Talent.

"It really fills you with a sense of pride," Stecich said.

Stecich, who is the president of the Leo High School Alumni Association, has been glued to primetime TV.

Following their performance on Tuesday and endorsement from judge Simon Cowell, the choir feels that they have more to bring.

"Simon has always been like one of our biggest supporters in this whole process, so we really do thank Simon for telling people to vote for us, and we're very excited for what's to come," one member said.

What's to come is another live show on Wednesday night, where the choir will learn if they've made it to the finals—possibly giving one more reason to celebrate Leo High School.

"The hope is always for them to win, but even if they don't, they've won in our hearts," Stecich said.

The winner of America's Got Talent gets $1 million. If they go the distance, the boys said they'd use that money to pay for college.

Local post gains national attention 

Their melodic harmony first caught the attention of CBS News Chicago's Audrina Sinclair more than a year ago during a morning news School Spotlight.

"Audrina put us on the map!" said Leo principal Shaka Rawls.

Sinclair posted the choir on Instagram with the caption, "So inspired by the young gentlemen at Leo High School! Such an amazing morning for our CBS Chicago School Spotlight!"

It was that post that catapulted the school choir to the national spotlight and the big stage.