Tanner Stransky
May 29, 2009 AT 04:00 AM EDT

After six weeks of hype, the YouTube sensation’s voice cracked during her semifinal performance of Cats‘ ”Memory” on May 24. ”I think we all gasped in horror,” Britain’s Got Talent judge Piers Morgan tells EW. But Boyle finished strong, earning a spot in the May 30 finals. What’ll she sing? Morgan suggests she go back to ”I Dreamed a Dream.” ”It’s her anthem!”

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