The stadium was packed when Ali Berke performed "The Star-Spangled Banner" prior to a baseball game in Milwaukee last year. She received a rousing applause and compliments throughout the rest of the day.

"I walked around the ballpark after. People came up to me and said, 'You did such a good job,'" Berke said.

Berke, 23, who grew up in Manhattan and Nassau County, hopes to perform at all 30 Major League Baseball stadiums in the United States.

So far, she has sung at Citi Field in Queens, plus stadiums in Baltimore, Philadelphia and Boston. Oakland, Miami and Wrigley Field in Chicago are on the way.

"It's just the best feeling in the world just knowing you worked so hard for something and it paid off," Berke said.

Berke is an aspiring pop singer and writer who has performed all around the country, but when she's not on the stage somewhere, she hopes to be in a ballpark singing "The Star-Spangled Banner" or "God Bless America."

"You feel more comfortable the more that you practice and the more that you make it your own, but it's definitely very nerve-wracking because you are in front of so many people when you are doing it," Berke said.

Berke also sings at arenas, and a performance before the Knicks play a game at Madison Square Garden is coming up.

The rising star says there is a lot of travel involved and she has to cover the flights and hotels herself. There is no compensation, but she says it is an honor for her to be invited to sing.

Berke does not have a deadline for when she wants to get to all 30 ballparks.

"If I just take them one at a time, and I have to understand that each place is going to be different. The temperature is going to be different. The crowd is going to be different. The accommodations are going to be different, so that's what I think makes each experience so unique and so special, because every one truly is so different," she said.