Ha -- then they run a clip of President Barack Obama singing a few lines from the song at a fundraiser, next to Testone singing it, with will.i.am saying they should have a sing-off.

She's quite good, the song just spools out; the tone really fits the song, it's enjoyable to listen to. "I love your voice," says Steven Tyler, praising her "raspy tone."

His tone fits the song, seems very sincere. Plus lets him do his little cracked voice falsetto; nice. It's all a bit soft; a bit like he's just performing though; not sure after all if he shouldn't have just go with his first pick, missing a certain passiong. Does do a great run at the end.

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