America's Got Talent's judges have dubbed the competition "too close to call" heading into Wednesday night's ninth-season finale, when one act will win the $1 million grand prize.

"This one is so close. It is too close to call," judge Howard Stern said at the conclusion of last night's performance show.

During Tuesday night's final performance show, the Top 6 finalist acts took the stage twice at Radio City Music Hall in what would be their last chance to win over home viewers.

The remaining acts are: Emily West, a singer and songwriter from New York, NY; AcroArmy, a group of acrobatic gymnastics; Quintavious Johnson, a 12-year-old singer from Franklin, TN; Mat Franco, a magician from Johnston, RI; The Sons of Serendip, a musical group of four friends from Boston, MA; and Miguel Dakota, a 21-year-old singer and guitarist from Monument, CO.

Each act first took the stage and reprised their breakthrough performance of the season with a little twist or spin. In addition to Howard, America's Got Talent judges Heidi Klum, Melanie "Mel B." Brown and Howie Mandel were thoroughly impressed with everyone. Afterward, each act brought something entirely new to the stage.

Quintavious Johnson sang "I'd Rather Go Blind" by Etta James. Mel B. said his voice is "just killer" and he's "incredible." Howie noted that the young boy's music fills his heart. Heidi called him "a true entertainer."

"I'm feeling Quintavious all over the place," Howard said. "This guy takes the stage and he owns it... He's a contender for this contest... I think you really got a shot."

Mat Franco did a little sleight of hand using cups and balls all the while reciting a long poem.

"You have an amazing set of balls," Howie said, adding that the magician has charisma and mesmerizes him.

Howard noted Mat Franco deserves to be in finals and had it harder than the singers to deliver his breakthrough performance. Heidi was "dazzled" and Mel B. noted the magician simply has it all.

Emily West sang "Chandelier" by Sia and Howard called it "moving" and loved it. Heidi said it was "beautiful," but Mel B. admitted she enjoyed the performance more the first time she had sung it on the show. Howie noted it was "a winning performance."

Miguel Dakota sang "Seven Nation Army" by The White Stripes. Mel B. could sense a bit of nerves but said he's got "that special, extra something" and he's very current. Howie agreed Miguel has the whole package, but Howard pointed out America simply needs to vote for the best talent and his performance wasn't enough to win.
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The Sons of Serendip performed "Somewhere Only We Know." Mel B. pointed out the guys have always been "consistent," while Howie said the group is the most talented act in the music category. Howard said if they don't win, they have "an image problem" because they're not the "it thing" despite their "superior talent." Heidi added that the guys always deliver.

AcroArmy repeated their "The Immortals" performance full of stunts and death-defying moves. Howie called the act "truly unbelievable" and gave them a "gold medal." Howard announced how they risk injury and "really deserve to win this thing."

In the second round, the acts had to step up their game and leave it all on the stage.

Mat Franco wowed with a brand new illusion utilizing "a human deck of cards" as well as a regular deck of cards. The judges were amazed. Howard realized he was telling multiple acts they deserved to win the competition, but he meant it.

"It would be awfully nice to see a magician win this whole thing, especially one as talented and gifted as you," Howard told Mat Franco.

"I have to say, every time you shock me... How do you do it?! You make magic become magic," Mel B. said.

Heidi called the magician "very versatile," while Howie felt proud of the act.

"You are worth a million dollars," Howie said.

The Sons of Serendip performed "Bring me to Life" by Evanescence. Heidi told the band they're "stellar" musicians and Mel B. said they "just killed it." Both women can't wait to buy their album. Howie then said America is grateful to witness their talent. Likewise, Howard noted they deserve to have America as their cheerleaders.

"This is too close to call. There is no way we can call it. I don't know who's going to win," Howard explained.

Quintavious Johnson sang "Let it Be" by The Beatles. Mel B. said he's "a joy to watch" and "a true superstar." Howard couldn't believe how cool and collected the young singer was onstage and it was "remarkable."

"Now, you are a true phenomenon," Heidi told the young artist.

Miguel Dakota sang a slow, stripped down version of "Billie Jean" by Michael Jackson. Heidi told the guitarist and vocalist he's "come full circle." Mel B. admitted he took a risk but she liked it a lot. Howie called him charismatic.

"You said you wanted your last performance to be your best and I do think this was your best performance," Howard explained.

AcroArmy, once again, created a spectacle of strength acts, dancing and athleticism. Mel B. was in awe, telling them they were "thrilling and amazing." Heidi said they managed to top themselves, which she didn't think was possible. Howard noted they're "unbelievable" and there's a reason why they're in the finals.

"That performance alone is a winning performance!" Howie yelled.

And last but not least, Emily West serenaded the audience with "The First Time Ever I Saw Your Face" by Roberta Flack. Heidi said she's so happy Emily never gave up and that America finally got to hear her voice. Mel B. noted the performance was "off the chain."

"If that can't win you a million bucks, I don't know what can!" Mel B. said.

Howie explained she never wavers and it was "a million dollar song." Howard said she has "charisma, original style and she can sing her butt off."