Siobhan Magnus is singing "I Believe" on "American Idol." She impresses Alicia Keys with her pipes. Wow, it's compelling from the get-go, a very pure tone and sincere. I'm not a huge fan of the song, but it works for her. Nails the high note near the end and she's got a nice sweet smile as she finishes.

"Picked toughest song of the night," says Randy -- but it was just OK for him, he says. Ellen disagrees, loved it. Kara didn't like it, "still don't know who you are." Simon thought wrong song, "old-fashioned" and didn't like the outfit.

PHOTOS: "American Idol" final round | "Idol" top 12 party with "Glee" stars

REWIND: See the winners and top finalists from each season of "American Idol"

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MORE: Read all of our other "American Idol" posts

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