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Echols, in particular, outsang everyone else on stage in some of the ensembles.

The singer/actress, who won the Best Supporting Actress for Dreamgirls in 2007 and outsang Beyoncé in a medley that same night, performed a tribute to the film talents who passed away last year.

Or should he choose Ms. Parker, the less obvious star of the two, but who outsang Ms. Taylor during the battle?

Most surprising of these crossover moments was the extended leash given to Lionel Richie, who has a country album forthcoming, and who handily outsang all of his duet partners -- Little Big Town, Darius Rucker, Rascal Flatts — on a medley of his hits.

Both got adrenalized in recent weeks, and she outsang Mr. McCreery in Tuesday’s final showdown — especially on her final song, “Like My Mother Does,” which will be her debut single — but it wasn’t enough to derail him.