Keith has been sober for four years, and this time—he's been to rehab three times in eight years—he says everything is different. Keith credits Nicole with saving him.

After Nicole found out Keith struggled with addiction, he says he would have understood if she left...but she didn't.

Inside the cover of Keith's latest CD, he wrote a beautiful love letter to his wife, the woman who stood by his side. It reads:

"Nicole Mary—I continue to be brought to my knees by this love of ours... I am in awe of how this blessed family we are creating stretches and fearlessly opens my vulnerable heart...and I just want to be a better man, for you, and father for our heavenly Sunday Rose and have you go to sleep every night knowing that no one has ever, or will ever, love you as much as I do...and all we need is faith."

"I think that's why the music sounded even better to me," Oprah says. "Because it came from that space."

More from the show
Watch Keith perform "Put You in a Song" Watch  
What Keith had to say after the show Watch  
See Keith's backstage performance of "Shut Out the Lights" Watch


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