Usher brought his sunglasses/silver chain cool to Tuesday’s American Idol in a show that saw Crystal Bowersox continue to impress while Casey James, Michael Lynche and Lee DeWyze got high praise from judges on a night that showcased the Top 10.

PHOTOS: American Idol’s Top 10

Bowersox took on Gladys Knight’s Midnight Train to Georgia and ditched her guitar for a piano, after hinting last week that change was coming. That change didn’t diminish the judges’ praise but caused Simon to warn her not to change her identity based on outside input!

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