Michelle Chamuel sang Keane’s “Somewhere Only We Know” and Taylor Swift’s “I Knew You Were Trouble.” Team Usher’s lone songbird was surprised during rehearsal by Swift herself, who gave Michelle her personal stamp of approval. Host Carson Daly called her the “most enthusiastic” response of the night, comparing it to that of the Backstreet Boys and ‘NSYNC during his “TRL” days. Levine said, “It’s unbelievable. Stop it already!”