America's Got Talent' recap: Simon Cowell warns semifinalists.

'America's Got Talent' recap: Simon Cowell warns semifinalists.
The final spots in the semifinals are up for grabs on "America's Got Talent."

But if you ask Simon Cowell, out of all 12 acts that performed Tuesday, "only three (contestants) were better than their first audition."

"When you come on this stage, you got to bring your 'A’ game," Cowell said, warning all competitors during Wednesday's results show.
"You got to get better if you want to win… I was frustrated not for myself, but for the acts."
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Good thing it's up to America to decide who moves on to the semifinals.
Only seven will advance, while the million-dollar dream for five of the acts will end tonight.
Season 13 "AGT" and "America's Got Talent: The Champions" winner Shin Lim returned Wednesday to perform a magical duet with violinist Lindsey Stirling, a quarter-finalist from Season 5.